From 9e3c08db40b8916968b9f30096c7be3f00ce9647 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 21 Apr 2024 13:44:51 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- third_party/rust/anyhow/.cargo-checksum.json | 1 + third_party/rust/anyhow/Cargo.toml | 66 ++ third_party/rust/anyhow/LICENSE-APACHE | 176 ++++ third_party/rust/anyhow/LICENSE-MIT | 23 + third_party/rust/anyhow/README.md | 182 ++++ third_party/rust/anyhow/build.rs | 131 +++ third_party/rust/anyhow/rust-toolchain.toml | 2 + third_party/rust/anyhow/src/backtrace.rs | 401 +++++++++ third_party/rust/anyhow/src/chain.rs | 102 +++ third_party/rust/anyhow/src/context.rs | 193 ++++ third_party/rust/anyhow/src/ensure.rs | 834 +++++++++++++++++ third_party/rust/anyhow/src/error.rs | 992 +++++++++++++++++++++ third_party/rust/anyhow/src/fmt.rs | 155 ++++ third_party/rust/anyhow/src/kind.rs | 116 +++ third_party/rust/anyhow/src/lib.rs | 680 ++++++++++++++ third_party/rust/anyhow/src/macros.rs | 231 +++++ third_party/rust/anyhow/src/ptr.rs | 199 +++++ third_party/rust/anyhow/src/wrapper.rs | 81 ++ third_party/rust/anyhow/tests/common/mod.rs | 14 + third_party/rust/anyhow/tests/compiletest.rs | 7 + third_party/rust/anyhow/tests/drop/mod.rs | 53 ++ third_party/rust/anyhow/tests/test_autotrait.rs | 13 + third_party/rust/anyhow/tests/test_backtrace.rs | 13 + third_party/rust/anyhow/tests/test_boxed.rs | 45 + third_party/rust/anyhow/tests/test_chain.rs | 69 ++ third_party/rust/anyhow/tests/test_context.rs | 172 ++++ third_party/rust/anyhow/tests/test_convert.rs | 46 + third_party/rust/anyhow/tests/test_downcast.rs | 123 +++ third_party/rust/anyhow/tests/test_ensure.rs | 718 +++++++++++++++ third_party/rust/anyhow/tests/test_ffi.rs | 18 + third_party/rust/anyhow/tests/test_fmt.rs | 94 ++ third_party/rust/anyhow/tests/test_macros.rs | 80 ++ third_party/rust/anyhow/tests/test_repr.rs | 29 + third_party/rust/anyhow/tests/test_source.rs | 62 ++ .../rust/anyhow/tests/ui/chained-comparison.rs | 8 + .../rust/anyhow/tests/ui/chained-comparison.stderr | 10 + third_party/rust/anyhow/tests/ui/empty-ensure.rs | 6 + .../rust/anyhow/tests/ui/empty-ensure.stderr | 12 + third_party/rust/anyhow/tests/ui/must-use.rs | 11 + third_party/rust/anyhow/tests/ui/must-use.stderr | 12 + third_party/rust/anyhow/tests/ui/no-impl.rs | 8 + third_party/rust/anyhow/tests/ui/no-impl.stderr | 31 + .../rust/anyhow/tests/ui/temporary-value.rs | 5 + .../rust/anyhow/tests/ui/temporary-value.stderr | 9 + .../rust/anyhow/tests/ui/wrong-interpolation.rs | 5 + .../anyhow/tests/ui/wrong-interpolation.stderr | 5 + 46 files changed, 6243 insertions(+) create mode 100644 third_party/rust/anyhow/.cargo-checksum.json create mode 100644 third_party/rust/anyhow/Cargo.toml create mode 100644 third_party/rust/anyhow/LICENSE-APACHE create mode 100644 third_party/rust/anyhow/LICENSE-MIT create mode 100644 third_party/rust/anyhow/README.md create mode 100644 third_party/rust/anyhow/build.rs create mode 100644 third_party/rust/anyhow/rust-toolchain.toml create mode 100644 third_party/rust/anyhow/src/backtrace.rs create mode 100644 third_party/rust/anyhow/src/chain.rs create mode 100644 third_party/rust/anyhow/src/context.rs create mode 100644 third_party/rust/anyhow/src/ensure.rs create mode 100644 third_party/rust/anyhow/src/error.rs create mode 100644 third_party/rust/anyhow/src/fmt.rs create mode 100644 third_party/rust/anyhow/src/kind.rs create mode 100644 third_party/rust/anyhow/src/lib.rs create mode 100644 third_party/rust/anyhow/src/macros.rs create mode 100644 third_party/rust/anyhow/src/ptr.rs create mode 100644 third_party/rust/anyhow/src/wrapper.rs create mode 100644 third_party/rust/anyhow/tests/common/mod.rs create mode 100644 third_party/rust/anyhow/tests/compiletest.rs create mode 100644 third_party/rust/anyhow/tests/drop/mod.rs create mode 100644 third_party/rust/anyhow/tests/test_autotrait.rs create mode 100644 third_party/rust/anyhow/tests/test_backtrace.rs create mode 100644 third_party/rust/anyhow/tests/test_boxed.rs create mode 100644 third_party/rust/anyhow/tests/test_chain.rs create mode 100644 third_party/rust/anyhow/tests/test_context.rs create mode 100644 third_party/rust/anyhow/tests/test_convert.rs create mode 100644 third_party/rust/anyhow/tests/test_downcast.rs create mode 100644 third_party/rust/anyhow/tests/test_ensure.rs create mode 100644 third_party/rust/anyhow/tests/test_ffi.rs create mode 100644 third_party/rust/anyhow/tests/test_fmt.rs create mode 100644 third_party/rust/anyhow/tests/test_macros.rs create mode 100644 third_party/rust/anyhow/tests/test_repr.rs create mode 100644 third_party/rust/anyhow/tests/test_source.rs create mode 100644 third_party/rust/anyhow/tests/ui/chained-comparison.rs create mode 100644 third_party/rust/anyhow/tests/ui/chained-comparison.stderr create mode 100644 third_party/rust/anyhow/tests/ui/empty-ensure.rs create mode 100644 third_party/rust/anyhow/tests/ui/empty-ensure.stderr create mode 100644 third_party/rust/anyhow/tests/ui/must-use.rs create mode 100644 third_party/rust/anyhow/tests/ui/must-use.stderr create mode 100644 third_party/rust/anyhow/tests/ui/no-impl.rs create mode 100644 third_party/rust/anyhow/tests/ui/no-impl.stderr create mode 100644 third_party/rust/anyhow/tests/ui/temporary-value.rs create mode 100644 third_party/rust/anyhow/tests/ui/temporary-value.stderr create mode 100644 third_party/rust/anyhow/tests/ui/wrong-interpolation.rs create mode 100644 third_party/rust/anyhow/tests/ui/wrong-interpolation.stderr (limited to 'third_party/rust/anyhow') diff --git a/third_party/rust/anyhow/.cargo-checksum.json b/third_party/rust/anyhow/.cargo-checksum.json new file mode 100644 index 0000000000..2062dae230 --- /dev/null +++ b/third_party/rust/anyhow/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"5fdf632cfab3b69bc900d04bd0db9ba771e73b36bc56515f2c13332b7f132091","LICENSE-APACHE":"62c7a1e35f56406896d7aa7ca52d0cc0d272ac022b5d2796e7d6905db8a3636a","LICENSE-MIT":"23f18e03dc49df91622fe2a76176497404e46ced8a715d9d2b67a7446571cca3","README.md":"62fc2a591c37e781f76fe4d89bcd964eca4fbde246bc43cd4e2fe9db2d30ee70","build.rs":"88bf7100143c79c0af683da7f28deaac031c9b9b213a6426560dc089b0ba45aa","rust-toolchain.toml":"6bbb61302978c736b2da03e4fb40e3beab908f85d533ab46fd541e637b5f3e0f","src/backtrace.rs":"5b4103a7d24d6f438a64b8cc0fafe28d55fc0ca090368174ce44d64e3940badd","src/chain.rs":"6edefc5f3c7d69683095862e54e3bb56faba5b3387bf2eeaed429da090007a0a","src/context.rs":"e129c580b5c2f3017dd977e4122a93f9fbc04b451e930d68f390f51e6be3bdcb","src/ensure.rs":"498bc9c7fb8b93168ed12f532cb97df6ccdda9ce25371586d7f5b1b1c98a14bf","src/error.rs":"e45d4dcfe64b1823b42fbf9bb260e6437987e8c2d51f92434db9d808b36e700a","src/fmt.rs":"c2d4aad6ce20625a70a7c091e3087b6a2c19a4a87c7a12edb4c98978307245ea","src/kind.rs":"332854c5eb07d44447c356a2e7dc585634b0da1ffbbfa81269c369deaefbc247","src/lib.rs":"cc000cada9b90ce0b9b9aaaeb56055b583dd055f48bd1444206dcc8a9b8a9935","src/macros.rs":"dd35f2ec2a0a25e4504fb04bcd42f6d0963bc0035aaaefc412f5ee1d78945fe1","src/ptr.rs":"f4e28bc9feba1e84160ca9d185008a51b5d72e168e6546f3e942f4258c361e19","src/wrapper.rs":"ff3ad72065a30cc32e9acb0614a30703c49c57b941a335c348b6439af684316b","tests/common/mod.rs":"f9088c2d7afafa64ff730b629272045b776bfafc2f5957508242da630635f2e1","tests/compiletest.rs":"022a8e400ef813d7ea1875b944549cee5125f6a995dc33e93b48cba3e1b57bd1","tests/drop/mod.rs":"08c3e553c1cc0d2dbd936fc45f4b5b1105057186affd6865e8d261e05f0f0646","tests/test_autotrait.rs":"981e792db353be2f14c7a1cabe43b5f1329c168cb7679077cc2be786a0920d48","tests/test_backtrace.rs":"0e50edbb33b6bd07ba89ff3db72fb7c688ba2a4371fccdbbb20309ab02948b6a","tests/test_boxed.rs":"6b26db0e2eb72afe9af7352ea820837aab90f8d486294616dd5dc34c1b94038c","tests/test_chain.rs":"3a8a8d7569913bd98c0e27c69d0bda35101e7fde7c056ed57cdd8ed018e4cbcb","tests/test_context.rs":"8409c53b328562c11e822bd6c3cd17e0d4d50b9bbb8fc3617333fd77303a6a33","tests/test_convert.rs":"7e7a8b4772a427a911014ac4d1083f9519000e786177f898808980dd9bdfde61","tests/test_downcast.rs":"797e69a72d125758c4c4897e5dc776d549d52cc9a6a633e0a33193f588a62b88","tests/test_ensure.rs":"c68ea8e3db9e887ce3a7314676e7ff5080aac0a37bc12cae9c6652dead93bcfa","tests/test_ffi.rs":"d0cb4c1d6d9154090982dee72ae3ebe05a5981f976058c3250f1c9da5a45edef","tests/test_fmt.rs":"17572596f257aac9aa2ec4620e292ca6a954128b94772bb948399fab53832e70","tests/test_macros.rs":"11f05010bc9b16319884c1286444100e30cddc2ecd1ffe5e0fd3fee5ffb32683","tests/test_repr.rs":"dbb9b04ddbe1ab31eb5331ea69f05bb3a147299da2275a3d4dcc92947b5591b9","tests/test_source.rs":"b80723cf635a4f8c4df21891b34bfab9ed2b2aa407e7a2f826d24e334cd5f88e","tests/ui/chained-comparison.rs":"6504b03d95b5acc232a7f4defc9f343b2be6733bf475fa0992e8e6545b912bd4","tests/ui/chained-comparison.stderr":"7f1d0a8c251b0ede2d30b3087ec157fc660945c97a642c4a5acf5a14ec58de34","tests/ui/empty-ensure.rs":"ab5bf37c846a0d689f26ce9257a27228411ed64154f9c950f1602d88a355d94b","tests/ui/empty-ensure.stderr":"315782f5f4246290fe190e3767b22c3dcaffaabc19c5ace0373537d53e765278","tests/ui/must-use.rs":"fb59860b43f673bf4a430a6036ba463e95028844d8dd4243cfe5ebc7f2be582f","tests/ui/must-use.stderr":"c2848c5f254b4c061eea6714d9baf709924aba06619eaf2a8b3aee1266b75f9e","tests/ui/no-impl.rs":"fab6cbf2f6ea510b86f567dfb3b7c31250a9fd71ae5d110dbb9188be569ec593","tests/ui/no-impl.stderr":"04415aeaa14995f47f06f35fb1f6971d332d2110aabca920c30ab0803d6a0a5e","tests/ui/temporary-value.rs":"4dcc96271b2403e6372cf4cfc813445e5ce4365fc6e156b6bc38274098499a70","tests/ui/temporary-value.stderr":"171f6c1c962503855480696e5d39e68946ec2a027b61a6f36ca1ad1b40265c5d","tests/ui/wrong-interpolation.rs":"9c44d4674c2dccd27b9dedd03341346ec02d993b41793ee89b5755202e7e367e","tests/ui/wrong-interpolation.stderr":"301e60e2eb9401782c7dc0b3580613a4cb2aafd4cc8065734a630a62e1161aa5"},"package":"224afbd727c3d6e4b90103ece64b8d1b67fbb1973b1046c2281eed3f3803f800"} \ No newline at end of file diff --git a/third_party/rust/anyhow/Cargo.toml b/third_party/rust/anyhow/Cargo.toml new file mode 100644 index 0000000000..d42c4704c0 --- /dev/null +++ b/third_party/rust/anyhow/Cargo.toml @@ -0,0 +1,66 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +edition = "2018" +rust-version = "1.39" +name = "anyhow" +version = "1.0.69" +authors = ["David Tolnay "] +description = "Flexible concrete Error type built on std::error::Error" +documentation = "https://docs.rs/anyhow" +readme = "README.md" +keywords = [ + "error", + "error-handling", +] +categories = [ + "rust-patterns", + "no-std", +] +license = "MIT OR Apache-2.0" +repository = "https://github.com/dtolnay/anyhow" + +[package.metadata.docs.rs] +targets = ["x86_64-unknown-linux-gnu"] +rustdoc-args = [ + "--cfg", + "doc_cfg", +] + +[lib] +doc-scrape-examples = false + +[dependencies.backtrace] +version = "0.3.51" +optional = true + +[dev-dependencies.futures] +version = "0.3" +default-features = false + +[dev-dependencies.rustversion] +version = "1.0.6" + +[dev-dependencies.syn] +version = "1.0" +features = ["full"] + +[dev-dependencies.thiserror] +version = "1.0" + +[dev-dependencies.trybuild] +version = "1.0.66" +features = ["diff"] + +[features] +default = ["std"] +std = [] diff --git a/third_party/rust/anyhow/LICENSE-APACHE b/third_party/rust/anyhow/LICENSE-APACHE new file mode 100644 index 0000000000..1b5ec8b78e --- /dev/null +++ b/third_party/rust/anyhow/LICENSE-APACHE @@ -0,0 +1,176 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. For the purposes of this definition, + "control" means (i) the power, direct or indirect, to cause the + direction or management of such entity, whether by contract or + otherwise, or (ii) ownership of fifty percent (50%) or more of the + outstanding shares, or (iii) beneficial ownership of such entity. + + "You" (or "Your") shall mean an individual or Legal Entity + exercising permissions granted by this License. + + "Source" form shall mean the preferred form for making modifications, + including but not limited to software source code, documentation + source, and configuration files. + + "Object" form shall mean any form resulting from mechanical + transformation or translation of a Source form, including but + not limited to compiled object code, generated documentation, + and conversions to other media types. + + "Work" shall mean the work of authorship, whether in Source or + Object form, made available under the License, as indicated by a + copyright notice that is included in or attached to the work + (an example is provided in the Appendix below). + + "Derivative Works" shall mean any work, whether in Source or Object + form, that is based on (or derived from) the Work and for which the + editorial revisions, annotations, elaborations, or other modifications + represent, as a whole, an original work of authorship. For the purposes + of this License, Derivative Works shall not include works that remain + separable from, or merely link (or bind by name) to the interfaces of, + the Work and Derivative Works thereof. + + "Contribution" shall mean any work of authorship, including + the original version of the Work and any modifications or additions + to that Work or Derivative Works thereof, that is intentionally + submitted to Licensor for inclusion in the Work by the copyright owner + or by an individual or Legal Entity authorized to submit on behalf of + the copyright owner. For the purposes of this definition, "submitted" + means any form of electronic, verbal, or written communication sent + to the Licensor or its representatives, including but not limited to + communication on electronic mailing lists, source code control systems, + and issue tracking systems that are managed by, or on behalf of, the + Licensor for the purpose of discussing and improving the Work, but + excluding communication that is conspicuously marked or otherwise + designated in writing by the copyright owner as "Not a Contribution." + + "Contributor" shall mean Licensor and any individual or Legal Entity + on behalf of whom a Contribution has been received by Licensor and + subsequently incorporated within the Work. + +2. Grant of Copyright License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + copyright license to reproduce, prepare Derivative Works of, + publicly display, publicly perform, sublicense, and distribute the + Work and such Derivative Works in Source or Object form. + +3. Grant of Patent License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + (except as stated in this section) patent license to make, have made, + use, offer to sell, sell, import, and otherwise transfer the Work, + where such license applies only to those patent claims licensable + by such Contributor that are necessarily infringed by their + Contribution(s) alone or by combination of their Contribution(s) + with the Work to which such Contribution(s) was submitted. If You + institute patent litigation against any entity (including a + cross-claim or counterclaim in a lawsuit) alleging that the Work + or a Contribution incorporated within the Work constitutes direct + or contributory patent infringement, then any patent licenses + granted to You under this License for that Work shall terminate + as of the date such litigation is filed. + +4. Redistribution. You may reproduce and distribute copies of the + Work or Derivative Works thereof in any medium, with or without + modifications, and in Source or Object form, provided that You + meet the following conditions: + + (a) You must give any other recipients of the Work or + Derivative Works a copy of this License; and + + (b) You must cause any modified files to carry prominent notices + stating that You changed the files; and + + (c) You must retain, in the Source form of any Derivative Works + that You distribute, all copyright, patent, trademark, and + attribution notices from the Source form of the Work, + excluding those notices that do not pertain to any part of + the Derivative Works; and + + (d) If the Work includes a "NOTICE" text file as part of its + distribution, then any Derivative Works that You distribute must + include a readable copy of the attribution notices contained + within such NOTICE file, excluding those notices that do not + pertain to any part of the Derivative Works, in at least one + of the following places: within a NOTICE text file distributed + as part of the Derivative Works; within the Source form or + documentation, if provided along with the Derivative Works; or, + within a display generated by the Derivative Works, if and + wherever such third-party notices normally appear. The contents + of the NOTICE file are for informational purposes only and + do not modify the License. You may add Your own attribution + notices within Derivative Works that You distribute, alongside + or as an addendum to the NOTICE text from the Work, provided + that such additional attribution notices cannot be construed + as modifying the License. + + You may add Your own copyright statement to Your modifications and + may provide additional or different license terms and conditions + for use, reproduction, or distribution of Your modifications, or + for any such Derivative Works as a whole, provided Your use, + reproduction, and distribution of the Work otherwise complies with + the conditions stated in this License. + +5. Submission of Contributions. Unless You explicitly state otherwise, + any Contribution intentionally submitted for inclusion in the Work + by You to the Licensor shall be under the terms and conditions of + this License, without any additional terms or conditions. + Notwithstanding the above, nothing herein shall supersede or modify + the terms of any separate license agreement you may have executed + with Licensor regarding such Contributions. + +6. Trademarks. This License does not grant permission to use the trade + names, trademarks, service marks, or product names of the Licensor, + except as required for reasonable and customary use in describing the + origin of the Work and reproducing the content of the NOTICE file. + +7. Disclaimer of Warranty. Unless required by applicable law or + agreed to in writing, Licensor provides the Work (and each + Contributor provides its Contributions) on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied, including, without limitation, any warranties or conditions + of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A + PARTICULAR PURPOSE. You are solely responsible for determining the + appropriateness of using or redistributing the Work and assume any + risks associated with Your exercise of permissions under this License. + +8. Limitation of Liability. In no event and under no legal theory, + whether in tort (including negligence), contract, or otherwise, + unless required by applicable law (such as deliberate and grossly + negligent acts) or agreed to in writing, shall any Contributor be + liable to You for damages, including any direct, indirect, special, + incidental, or consequential damages of any character arising as a + result of this License or out of the use or inability to use the + Work (including but not limited to damages for loss of goodwill, + work stoppage, computer failure or malfunction, or any and all + other commercial damages or losses), even if such Contributor + has been advised of the possibility of such damages. + +9. Accepting Warranty or Additional Liability. While redistributing + the Work or Derivative Works thereof, You may choose to offer, + and charge a fee for, acceptance of support, warranty, indemnity, + or other liability obligations and/or rights consistent with this + License. However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + +END OF TERMS AND CONDITIONS diff --git a/third_party/rust/anyhow/LICENSE-MIT b/third_party/rust/anyhow/LICENSE-MIT new file mode 100644 index 0000000000..31aa79387f --- /dev/null +++ b/third_party/rust/anyhow/LICENSE-MIT @@ -0,0 +1,23 @@ +Permission is hereby granted, free of charge, to any +person obtaining a copy of this software and associated +documentation files (the "Software"), to deal in the +Software without restriction, including without +limitation the rights to use, copy, modify, merge, +publish, distribute, sublicense, and/or sell copies of +the Software, and to permit persons to whom the Software +is furnished to do so, subject to the following +conditions: + +The above copyright notice and this permission notice +shall be included in all copies or substantial portions +of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF +ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED +TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A +PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/third_party/rust/anyhow/README.md b/third_party/rust/anyhow/README.md new file mode 100644 index 0000000000..6380c1c04c --- /dev/null +++ b/third_party/rust/anyhow/README.md @@ -0,0 +1,182 @@ +Anyhow ¯\\\_(°ペ)\_/¯ +========================== + +[github](https://github.com/dtolnay/anyhow) +[crates.io](https://crates.io/crates/anyhow) +[docs.rs](https://docs.rs/anyhow) +[build status](https://github.com/dtolnay/anyhow/actions?query=branch%3Amaster) + +This library provides [`anyhow::Error`][Error], a trait object based error type +for easy idiomatic error handling in Rust applications. + +[Error]: https://docs.rs/anyhow/1.0/anyhow/struct.Error.html + +```toml +[dependencies] +anyhow = "1.0" +``` + +*Compiler support: requires rustc 1.39+* + +
+ +## Details + +- Use `Result`, or equivalently `anyhow::Result`, as the + return type of any fallible function. + + Within the function, use `?` to easily propagate any error that implements the + `std::error::Error` trait. + + ```rust + use anyhow::Result; + + fn get_cluster_info() -> Result { + let config = std::fs::read_to_string("cluster.json")?; + let map: ClusterMap = serde_json::from_str(&config)?; + Ok(map) + } + ``` + +- Attach context to help the person troubleshooting the error understand where + things went wrong. A low-level error like "No such file or directory" can be + annoying to debug without more context about what higher level step the + application was in the middle of. + + ```rust + use anyhow::{Context, Result}; + + fn main() -> Result<()> { + ... + it.detach().context("Failed to detach the important thing")?; + + let content = std::fs::read(path) + .with_context(|| format!("Failed to read instrs from {}", path))?; + ... + } + ``` + + ```console + Error: Failed to read instrs from ./path/to/instrs.json + + Caused by: + No such file or directory (os error 2) + ``` + +- Downcasting is supported and can be by value, by shared reference, or by + mutable reference as needed. + + ```rust + // If the error was caused by redaction, then return a + // tombstone instead of the content. + match root_cause.downcast_ref::() { + Some(DataStoreError::Censored(_)) => Ok(Poll::Ready(REDACTED_CONTENT)), + None => Err(error), + } + ``` + +- If using the nightly channel, or stable with `features = ["backtrace"]`, a + backtrace is captured and printed with the error if the underlying error type + does not already provide its own. In order to see backtraces, they must be + enabled through the environment variables described in [`std::backtrace`]: + + - If you want panics and errors to both have backtraces, set + `RUST_BACKTRACE=1`; + - If you want only errors to have backtraces, set `RUST_LIB_BACKTRACE=1`; + - If you want only panics to have backtraces, set `RUST_BACKTRACE=1` and + `RUST_LIB_BACKTRACE=0`. + + The tracking issue for this feature is [rust-lang/rust#53487]. + + [`std::backtrace`]: https://doc.rust-lang.org/std/backtrace/index.html#environment-variables + [rust-lang/rust#53487]: https://github.com/rust-lang/rust/issues/53487 + +- Anyhow works with any error type that has an impl of `std::error::Error`, + including ones defined in your crate. We do not bundle a `derive(Error)` macro + but you can write the impls yourself or use a standalone macro like + [thiserror]. + + ```rust + use thiserror::Error; + + #[derive(Error, Debug)] + pub enum FormatError { + #[error("Invalid header (expected {expected:?}, got {found:?})")] + InvalidHeader { + expected: String, + found: String, + }, + #[error("Missing attribute: {0}")] + MissingAttribute(String), + } + ``` + +- One-off error messages can be constructed using the `anyhow!` macro, which + supports string interpolation and produces an `anyhow::Error`. + + ```rust + return Err(anyhow!("Missing attribute: {}", missing)); + ``` + + A `bail!` macro is provided as a shorthand for the same early return. + + ```rust + bail!("Missing attribute: {}", missing); + ``` + +
+ +## No-std support + +In no_std mode, the same API is almost all available and works the same way. To +depend on Anyhow in no_std mode, disable our default enabled "std" feature in +Cargo.toml. A global allocator is required. + +```toml +[dependencies] +anyhow = { version = "1.0", default-features = false } +``` + +Since the `?`-based error conversions would normally rely on the +`std::error::Error` trait which is only available through std, no_std mode will +require an explicit `.map_err(Error::msg)` when working with a non-Anyhow error +type inside a function that returns Anyhow's error type. + +
+ +## Comparison to failure + +The `anyhow::Error` type works something like `failure::Error`, but unlike +failure ours is built around the standard library's `std::error::Error` trait +rather than a separate trait `failure::Fail`. The standard library has adopted +the necessary improvements for this to be possible as part of [RFC 2504]. + +[RFC 2504]: https://github.com/rust-lang/rfcs/blob/master/text/2504-fix-error.md + +
+ +## Comparison to thiserror + +Use Anyhow if you don't care what error type your functions return, you just +want it to be easy. This is common in application code. Use [thiserror] if you +are a library that wants to design your own dedicated error type(s) so that on +failures the caller gets exactly the information that you choose. + +[thiserror]: https://github.com/dtolnay/thiserror + +
+ +#### License + + +Licensed under either of Apache License, Version +2.0 or MIT license at your option. + + +
+ + +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in this crate by you, as defined in the Apache-2.0 license, shall +be dual licensed as above, without any additional terms or conditions. + diff --git a/third_party/rust/anyhow/build.rs b/third_party/rust/anyhow/build.rs new file mode 100644 index 0000000000..38006832e2 --- /dev/null +++ b/third_party/rust/anyhow/build.rs @@ -0,0 +1,131 @@ +#![allow(clippy::option_if_let_else)] + +use std::env; +use std::fs; +use std::path::Path; +use std::process::{Command, ExitStatus, Stdio}; +use std::str; + +#[cfg(all(feature = "backtrace", not(feature = "std")))] +compile_error! { + "`backtrace` feature without `std` feature is not supported" +} + +// This code exercises the surface area that we expect of the std Backtrace +// type. If the current toolchain is able to compile it, we go ahead and use +// backtrace in anyhow. +const PROBE: &str = r#" + #![feature(error_generic_member_access, provide_any)] + + use std::any::{Demand, Provider}; + use std::backtrace::{Backtrace, BacktraceStatus}; + use std::error::Error; + use std::fmt::{self, Display}; + + #[derive(Debug)] + struct E { + backtrace: Backtrace, + } + + impl Display for E { + fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result { + unimplemented!() + } + } + + impl Error for E { + fn provide<'a>(&'a self, demand: &mut Demand<'a>) { + demand.provide_ref(&self.backtrace); + } + } + + struct P; + + impl Provider for P { + fn provide<'a>(&'a self, _demand: &mut Demand<'a>) {} + } + + const _: fn() = || { + let backtrace: Backtrace = Backtrace::capture(); + let status: BacktraceStatus = backtrace.status(); + match status { + BacktraceStatus::Captured | BacktraceStatus::Disabled | _ => {} + } + }; + + const _: fn(&dyn Error) -> Option<&Backtrace> = |err| err.request_ref::(); +"#; + +fn main() { + if cfg!(feature = "std") { + match compile_probe() { + Some(status) if status.success() => println!("cargo:rustc-cfg=backtrace"), + _ => {} + } + } + + let rustc = match rustc_minor_version() { + Some(rustc) => rustc, + None => return, + }; + + if rustc < 51 { + println!("cargo:rustc-cfg=anyhow_no_ptr_addr_of"); + } + + if rustc < 52 { + println!("cargo:rustc-cfg=anyhow_no_fmt_arguments_as_str"); + } +} + +fn compile_probe() -> Option { + let rustc = env::var_os("RUSTC")?; + let out_dir = env::var_os("OUT_DIR")?; + let probefile = Path::new(&out_dir).join("probe.rs"); + fs::write(&probefile, PROBE).ok()?; + + // Make sure to pick up Cargo rustc configuration. + let mut cmd = if let Some(wrapper) = env::var_os("RUSTC_WRAPPER") { + let mut cmd = Command::new(wrapper); + // The wrapper's first argument is supposed to be the path to rustc. + cmd.arg(rustc); + cmd + } else { + Command::new(rustc) + }; + + cmd.stderr(Stdio::null()) + .arg("--edition=2018") + .arg("--crate-name=anyhow_build") + .arg("--crate-type=lib") + .arg("--emit=metadata") + .arg("--out-dir") + .arg(out_dir) + .arg(probefile); + + if let Some(target) = env::var_os("TARGET") { + cmd.arg("--target").arg(target); + } + + // If Cargo wants to set RUSTFLAGS, use that. + if let Ok(rustflags) = env::var("CARGO_ENCODED_RUSTFLAGS") { + if !rustflags.is_empty() { + for arg in rustflags.split('\x1f') { + cmd.arg(arg); + } + } + } + + cmd.status().ok() +} + +fn rustc_minor_version() -> Option { + let rustc = env::var_os("RUSTC")?; + let output = Command::new(rustc).arg("--version").output().ok()?; + let version = str::from_utf8(&output.stdout).ok()?; + let mut pieces = version.split('.'); + if pieces.next() != Some("rustc 1") { + return None; + } + pieces.next()?.parse().ok() +} diff --git a/third_party/rust/anyhow/rust-toolchain.toml b/third_party/rust/anyhow/rust-toolchain.toml new file mode 100644 index 0000000000..20fe888c30 --- /dev/null +++ b/third_party/rust/anyhow/rust-toolchain.toml @@ -0,0 +1,2 @@ +[toolchain] +components = ["rust-src"] diff --git a/third_party/rust/anyhow/src/backtrace.rs b/third_party/rust/anyhow/src/backtrace.rs new file mode 100644 index 0000000000..23c0c85ce2 --- /dev/null +++ b/third_party/rust/anyhow/src/backtrace.rs @@ -0,0 +1,401 @@ +#[cfg(backtrace)] +pub(crate) use std::backtrace::{Backtrace, BacktraceStatus}; + +#[cfg(all(not(backtrace), feature = "backtrace"))] +pub(crate) use self::capture::{Backtrace, BacktraceStatus}; + +#[cfg(not(any(backtrace, feature = "backtrace")))] +pub(crate) enum Backtrace {} + +#[cfg(backtrace)] +macro_rules! impl_backtrace { + () => { + std::backtrace::Backtrace + }; +} + +#[cfg(all(not(backtrace), feature = "backtrace"))] +macro_rules! impl_backtrace { + () => { + impl core::fmt::Debug + core::fmt::Display + }; +} + +#[cfg(any(backtrace, feature = "backtrace"))] +macro_rules! backtrace { + () => { + Some(crate::backtrace::Backtrace::capture()) + }; +} + +#[cfg(not(any(backtrace, feature = "backtrace")))] +macro_rules! backtrace { + () => { + None + }; +} + +#[cfg(backtrace)] +macro_rules! backtrace_if_absent { + ($err:expr) => { + match ($err as &dyn std::error::Error).request_ref::() { + Some(_) => None, + None => backtrace!(), + } + }; +} + +#[cfg(all(feature = "std", not(backtrace), feature = "backtrace"))] +macro_rules! backtrace_if_absent { + ($err:expr) => { + backtrace!() + }; +} + +#[cfg(all(feature = "std", not(backtrace), not(feature = "backtrace")))] +macro_rules! backtrace_if_absent { + ($err:expr) => { + None + }; +} + +#[cfg(all(not(backtrace), feature = "backtrace"))] +mod capture { + use backtrace::{BacktraceFmt, BytesOrWideString, Frame, PrintFmt, SymbolName}; + use core::cell::UnsafeCell; + use core::fmt::{self, Debug, Display}; + use core::sync::atomic::{AtomicUsize, Ordering}; + use std::borrow::Cow; + use std::env; + use std::path::{self, Path, PathBuf}; + use std::sync::Once; + + pub(crate) struct Backtrace { + inner: Inner, + } + + pub(crate) enum BacktraceStatus { + Unsupported, + Disabled, + Captured, + } + + enum Inner { + Unsupported, + Disabled, + Captured(LazilyResolvedCapture), + } + + struct Capture { + actual_start: usize, + resolved: bool, + frames: Vec, + } + + struct BacktraceFrame { + frame: Frame, + symbols: Vec, + } + + struct BacktraceSymbol { + name: Option>, + filename: Option, + lineno: Option, + colno: Option, + } + + enum BytesOrWide { + Bytes(Vec), + Wide(Vec), + } + + impl Debug for Backtrace { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + let capture = match &self.inner { + Inner::Unsupported => return fmt.write_str(""), + Inner::Disabled => return fmt.write_str(""), + Inner::Captured(c) => c.force(), + }; + + let frames = &capture.frames[capture.actual_start..]; + + write!(fmt, "Backtrace ")?; + + let mut dbg = fmt.debug_list(); + + for frame in frames { + if frame.frame.ip().is_null() { + continue; + } + + dbg.entries(&frame.symbols); + } + + dbg.finish() + } + } + + impl Debug for BacktraceFrame { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + let mut dbg = fmt.debug_list(); + dbg.entries(&self.symbols); + dbg.finish() + } + } + + impl Debug for BacktraceSymbol { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + write!(fmt, "{{ ")?; + + if let Some(fn_name) = self.name.as_ref().map(|b| SymbolName::new(b)) { + write!(fmt, "fn: \"{:#}\"", fn_name)?; + } else { + write!(fmt, "fn: ")?; + } + + if let Some(fname) = self.filename.as_ref() { + write!(fmt, ", file: \"{:?}\"", fname)?; + } + + if let Some(line) = self.lineno { + write!(fmt, ", line: {:?}", line)?; + } + + write!(fmt, " }}") + } + } + + impl Debug for BytesOrWide { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + output_filename( + fmt, + match self { + BytesOrWide::Bytes(w) => BytesOrWideString::Bytes(w), + BytesOrWide::Wide(w) => BytesOrWideString::Wide(w), + }, + PrintFmt::Short, + env::current_dir().as_ref().ok(), + ) + } + } + + impl Backtrace { + fn enabled() -> bool { + static ENABLED: AtomicUsize = AtomicUsize::new(0); + match ENABLED.load(Ordering::Relaxed) { + 0 => {} + 1 => return false, + _ => return true, + } + let enabled = match env::var_os("RUST_LIB_BACKTRACE") { + Some(s) => s != "0", + None => match env::var_os("RUST_BACKTRACE") { + Some(s) => s != "0", + None => false, + }, + }; + ENABLED.store(enabled as usize + 1, Ordering::Relaxed); + enabled + } + + #[inline(never)] // want to make sure there's a frame here to remove + pub(crate) fn capture() -> Backtrace { + if Backtrace::enabled() { + Backtrace::create(Backtrace::capture as usize) + } else { + let inner = Inner::Disabled; + Backtrace { inner } + } + } + + // Capture a backtrace which starts just before the function addressed + // by `ip` + fn create(ip: usize) -> Backtrace { + let mut frames = Vec::new(); + let mut actual_start = None; + backtrace::trace(|frame| { + frames.push(BacktraceFrame { + frame: frame.clone(), + symbols: Vec::new(), + }); + if frame.symbol_address() as usize == ip && actual_start.is_none() { + actual_start = Some(frames.len() + 1); + } + true + }); + + // If no frames came out assume that this is an unsupported platform + // since `backtrace` doesn't provide a way of learning this right + // now, and this should be a good enough approximation. + let inner = if frames.is_empty() { + Inner::Unsupported + } else { + Inner::Captured(LazilyResolvedCapture::new(Capture { + actual_start: actual_start.unwrap_or(0), + frames, + resolved: false, + })) + }; + + Backtrace { inner } + } + + pub(crate) fn status(&self) -> BacktraceStatus { + match self.inner { + Inner::Unsupported => BacktraceStatus::Unsupported, + Inner::Disabled => BacktraceStatus::Disabled, + Inner::Captured(_) => BacktraceStatus::Captured, + } + } + } + + impl Display for Backtrace { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + let capture = match &self.inner { + Inner::Unsupported => return fmt.write_str("unsupported backtrace"), + Inner::Disabled => return fmt.write_str("disabled backtrace"), + Inner::Captured(c) => c.force(), + }; + + let full = fmt.alternate(); + let (frames, style) = if full { + (&capture.frames[..], PrintFmt::Full) + } else { + (&capture.frames[capture.actual_start..], PrintFmt::Short) + }; + + // When printing paths we try to strip the cwd if it exists, + // otherwise we just print the path as-is. Note that we also only do + // this for the short format, because if it's full we presumably + // want to print everything. + let cwd = env::current_dir(); + let mut print_path = move |fmt: &mut fmt::Formatter, path: BytesOrWideString| { + output_filename(fmt, path, style, cwd.as_ref().ok()) + }; + + let mut f = BacktraceFmt::new(fmt, style, &mut print_path); + f.add_context()?; + for frame in frames { + let mut f = f.frame(); + if frame.symbols.is_empty() { + f.print_raw(frame.frame.ip(), None, None, None)?; + } else { + for symbol in frame.symbols.iter() { + f.print_raw_with_column( + frame.frame.ip(), + symbol.name.as_ref().map(|b| SymbolName::new(b)), + symbol.filename.as_ref().map(|b| match b { + BytesOrWide::Bytes(w) => BytesOrWideString::Bytes(w), + BytesOrWide::Wide(w) => BytesOrWideString::Wide(w), + }), + symbol.lineno, + symbol.colno, + )?; + } + } + } + f.finish()?; + Ok(()) + } + } + + struct LazilyResolvedCapture { + sync: Once, + capture: UnsafeCell, + } + + impl LazilyResolvedCapture { + fn new(capture: Capture) -> Self { + LazilyResolvedCapture { + sync: Once::new(), + capture: UnsafeCell::new(capture), + } + } + + fn force(&self) -> &Capture { + self.sync.call_once(|| { + // Safety: This exclusive reference can't overlap with any + // others. `Once` guarantees callers will block until this + // closure returns. `Once` also guarantees only a single caller + // will enter this closure. + unsafe { &mut *self.capture.get() }.resolve(); + }); + + // Safety: This shared reference can't overlap with the exclusive + // reference above. + unsafe { &*self.capture.get() } + } + } + + // Safety: Access to the inner value is synchronized using a thread-safe + // `Once`. So long as `Capture` is `Sync`, `LazilyResolvedCapture` is too + unsafe impl Sync for LazilyResolvedCapture where Capture: Sync {} + + impl Capture { + fn resolve(&mut self) { + // If we're already resolved, nothing to do! + if self.resolved { + return; + } + self.resolved = true; + + for frame in self.frames.iter_mut() { + let symbols = &mut frame.symbols; + let frame = &frame.frame; + backtrace::resolve_frame(frame, |symbol| { + symbols.push(BacktraceSymbol { + name: symbol.name().map(|m| m.as_bytes().to_vec()), + filename: symbol.filename_raw().map(|b| match b { + BytesOrWideString::Bytes(b) => BytesOrWide::Bytes(b.to_owned()), + BytesOrWideString::Wide(b) => BytesOrWide::Wide(b.to_owned()), + }), + lineno: symbol.lineno(), + colno: symbol.colno(), + }); + }); + } + } + } + + // Prints the filename of the backtrace frame. + fn output_filename( + fmt: &mut fmt::Formatter, + bows: BytesOrWideString, + print_fmt: PrintFmt, + cwd: Option<&PathBuf>, + ) -> fmt::Result { + let file: Cow = match bows { + #[cfg(unix)] + BytesOrWideString::Bytes(bytes) => { + use std::os::unix::ffi::OsStrExt; + Path::new(std::ffi::OsStr::from_bytes(bytes)).into() + } + #[cfg(not(unix))] + BytesOrWideString::Bytes(bytes) => { + Path::new(std::str::from_utf8(bytes).unwrap_or("")).into() + } + #[cfg(windows)] + BytesOrWideString::Wide(wide) => { + use std::os::windows::ffi::OsStringExt; + Cow::Owned(std::ffi::OsString::from_wide(wide).into()) + } + #[cfg(not(windows))] + BytesOrWideString::Wide(_wide) => Path::new("").into(), + }; + if print_fmt == PrintFmt::Short && file.is_absolute() { + if let Some(cwd) = cwd { + if let Ok(stripped) = file.strip_prefix(&cwd) { + if let Some(s) = stripped.to_str() { + return write!(fmt, ".{}{}", path::MAIN_SEPARATOR, s); + } + } + } + } + Display::fmt(&file.display(), fmt) + } +} + +fn _assert_send_sync() { + fn _assert() {} + _assert::(); +} diff --git a/third_party/rust/anyhow/src/chain.rs b/third_party/rust/anyhow/src/chain.rs new file mode 100644 index 0000000000..f7baff29f1 --- /dev/null +++ b/third_party/rust/anyhow/src/chain.rs @@ -0,0 +1,102 @@ +use self::ChainState::*; +use crate::StdError; + +#[cfg(feature = "std")] +use std::vec; + +#[cfg(feature = "std")] +pub(crate) use crate::Chain; + +#[cfg(not(feature = "std"))] +pub(crate) struct Chain<'a> { + state: ChainState<'a>, +} + +#[derive(Clone)] +pub(crate) enum ChainState<'a> { + Linked { + next: Option<&'a (dyn StdError + 'static)>, + }, + #[cfg(feature = "std")] + Buffered { + rest: vec::IntoIter<&'a (dyn StdError + 'static)>, + }, +} + +impl<'a> Chain<'a> { + #[cold] + pub fn new(head: &'a (dyn StdError + 'static)) -> Self { + Chain { + state: ChainState::Linked { next: Some(head) }, + } + } +} + +impl<'a> Iterator for Chain<'a> { + type Item = &'a (dyn StdError + 'static); + + fn next(&mut self) -> Option { + match &mut self.state { + Linked { next } => { + let error = (*next)?; + *next = error.source(); + Some(error) + } + #[cfg(feature = "std")] + Buffered { rest } => rest.next(), + } + } + + fn size_hint(&self) -> (usize, Option) { + let len = self.len(); + (len, Some(len)) + } +} + +#[cfg(feature = "std")] +impl DoubleEndedIterator for Chain<'_> { + fn next_back(&mut self) -> Option { + match &mut self.state { + Linked { mut next } => { + let mut rest = Vec::new(); + while let Some(cause) = next { + next = cause.source(); + rest.push(cause); + } + let mut rest = rest.into_iter(); + let last = rest.next_back(); + self.state = Buffered { rest }; + last + } + Buffered { rest } => rest.next_back(), + } + } +} + +impl ExactSizeIterator for Chain<'_> { + fn len(&self) -> usize { + match &self.state { + Linked { mut next } => { + let mut len = 0; + while let Some(cause) = next { + next = cause.source(); + len += 1; + } + len + } + #[cfg(feature = "std")] + Buffered { rest } => rest.len(), + } + } +} + +#[cfg(feature = "std")] +impl Default for Chain<'_> { + fn default() -> Self { + Chain { + state: ChainState::Buffered { + rest: Vec::new().into_iter(), + }, + } + } +} diff --git a/third_party/rust/anyhow/src/context.rs b/third_party/rust/anyhow/src/context.rs new file mode 100644 index 0000000000..9df86937bd --- /dev/null +++ b/third_party/rust/anyhow/src/context.rs @@ -0,0 +1,193 @@ +use crate::error::ContextError; +use crate::{Context, Error, StdError}; +use core::convert::Infallible; +use core::fmt::{self, Debug, Display, Write}; + +#[cfg(backtrace)] +use std::any::{Demand, Provider}; + +mod ext { + use super::*; + + pub trait StdError { + fn ext_context(self, context: C) -> Error + where + C: Display + Send + Sync + 'static; + } + + #[cfg(feature = "std")] + impl StdError for E + where + E: std::error::Error + Send + Sync + 'static, + { + fn ext_context(self, context: C) -> Error + where + C: Display + Send + Sync + 'static, + { + let backtrace = backtrace_if_absent!(&self); + Error::from_context(context, self, backtrace) + } + } + + impl StdError for Error { + fn ext_context(self, context: C) -> Error + where + C: Display + Send + Sync + 'static, + { + self.context(context) + } + } +} + +impl Context for Result +where + E: ext::StdError + Send + Sync + 'static, +{ + fn context(self, context: C) -> Result + where + C: Display + Send + Sync + 'static, + { + // Not using map_err to save 2 useless frames off the captured backtrace + // in ext_context. + match self { + Ok(ok) => Ok(ok), + Err(error) => Err(error.ext_context(context)), + } + } + + fn with_context(self, context: F) -> Result + where + C: Display + Send + Sync + 'static, + F: FnOnce() -> C, + { + match self { + Ok(ok) => Ok(ok), + Err(error) => Err(error.ext_context(context())), + } + } +} + +/// ``` +/// # type T = (); +/// # +/// use anyhow::{Context, Result}; +/// +/// fn maybe_get() -> Option { +/// # const IGNORE: &str = stringify! { +/// ... +/// # }; +/// # unimplemented!() +/// } +/// +/// fn demo() -> Result<()> { +/// let t = maybe_get().context("there is no T")?; +/// # const IGNORE: &str = stringify! { +/// ... +/// # }; +/// # unimplemented!() +/// } +/// ``` +impl Context for Option { + fn context(self, context: C) -> Result + where + C: Display + Send + Sync + 'static, + { + // Not using ok_or_else to save 2 useless frames off the captured + // backtrace. + match self { + Some(ok) => Ok(ok), + None => Err(Error::from_display(context, backtrace!())), + } + } + + fn with_context(self, context: F) -> Result + where + C: Display + Send + Sync + 'static, + F: FnOnce() -> C, + { + match self { + Some(ok) => Ok(ok), + None => Err(Error::from_display(context(), backtrace!())), + } + } +} + +impl Debug for ContextError +where + C: Display, + E: Debug, +{ + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.debug_struct("Error") + .field("context", &Quoted(&self.context)) + .field("source", &self.error) + .finish() + } +} + +impl Display for ContextError +where + C: Display, +{ + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + Display::fmt(&self.context, f) + } +} + +impl StdError for ContextError +where + C: Display, + E: StdError + 'static, +{ + fn source(&self) -> Option<&(dyn StdError + 'static)> { + Some(&self.error) + } + + #[cfg(backtrace)] + fn provide<'a>(&'a self, demand: &mut Demand<'a>) { + StdError::provide(&self.error, demand); + } +} + +impl StdError for ContextError +where + C: Display, +{ + fn source(&self) -> Option<&(dyn StdError + 'static)> { + Some(unsafe { crate::ErrorImpl::error(self.error.inner.by_ref()) }) + } + + #[cfg(backtrace)] + fn provide<'a>(&'a self, demand: &mut Demand<'a>) { + Provider::provide(&self.error, demand); + } +} + +struct Quoted(C); + +impl Debug for Quoted +where + C: Display, +{ + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_char('"')?; + Quoted(&mut *formatter).write_fmt(format_args!("{}", self.0))?; + formatter.write_char('"')?; + Ok(()) + } +} + +impl Write for Quoted<&mut fmt::Formatter<'_>> { + fn write_str(&mut self, s: &str) -> fmt::Result { + Display::fmt(&s.escape_debug(), self.0) + } +} + +pub(crate) mod private { + use super::*; + + pub trait Sealed {} + + impl Sealed for Result where E: ext::StdError {} + impl Sealed for Option {} +} diff --git a/third_party/rust/anyhow/src/ensure.rs b/third_party/rust/anyhow/src/ensure.rs new file mode 100644 index 0000000000..0ab4471231 --- /dev/null +++ b/third_party/rust/anyhow/src/ensure.rs @@ -0,0 +1,834 @@ +use crate::Error; +use alloc::string::String; +use core::fmt::{self, Debug, Write}; +use core::mem::MaybeUninit; +use core::ptr; +use core::slice; +use core::str; + +#[doc(hidden)] +pub trait BothDebug { + fn __dispatch_ensure(self, msg: &'static str) -> Error; +} + +impl BothDebug for (A, B) +where + A: Debug, + B: Debug, +{ + fn __dispatch_ensure(self, msg: &'static str) -> Error { + render(msg, &self.0, &self.1) + } +} + +#[doc(hidden)] +pub trait NotBothDebug { + fn __dispatch_ensure(self, msg: &'static str) -> Error; +} + +impl NotBothDebug for &(A, B) { + fn __dispatch_ensure(self, msg: &'static str) -> Error { + Error::msg(msg) + } +} + +struct Buf { + bytes: [MaybeUninit; 40], + written: usize, +} + +impl Buf { + fn new() -> Self { + Buf { + bytes: [MaybeUninit::uninit(); 40], + written: 0, + } + } + + fn as_str(&self) -> &str { + unsafe { + str::from_utf8_unchecked(slice::from_raw_parts( + self.bytes.as_ptr().cast::(), + self.written, + )) + } + } +} + +impl Write for Buf { + fn write_str(&mut self, s: &str) -> fmt::Result { + if s.bytes().any(|b| b == b' ' || b == b'\n') { + return Err(fmt::Error); + } + + let remaining = self.bytes.len() - self.written; + if s.len() > remaining { + return Err(fmt::Error); + } + + unsafe { + ptr::copy_nonoverlapping( + s.as_ptr(), + self.bytes.as_mut_ptr().add(self.written).cast::(), + s.len(), + ); + } + self.written += s.len(); + Ok(()) + } +} + +fn render(msg: &'static str, lhs: &dyn Debug, rhs: &dyn Debug) -> Error { + let mut lhs_buf = Buf::new(); + if fmt::write(&mut lhs_buf, format_args!("{:?}", lhs)).is_ok() { + let mut rhs_buf = Buf::new(); + if fmt::write(&mut rhs_buf, format_args!("{:?}", rhs)).is_ok() { + let lhs_str = lhs_buf.as_str(); + let rhs_str = rhs_buf.as_str(); + // "{msg} ({lhs} vs {rhs})" + let len = msg.len() + 2 + lhs_str.len() + 4 + rhs_str.len() + 1; + let mut string = String::with_capacity(len); + string.push_str(msg); + string.push_str(" ("); + string.push_str(lhs_str); + string.push_str(" vs "); + string.push_str(rhs_str); + string.push(')'); + return Error::msg(string); + } + } + Error::msg(msg) +} + +#[doc(hidden)] +#[macro_export] +macro_rules! __parse_ensure { + (atom () $bail:tt $fuel:tt {($($rhs:tt)+) ($($lhs:tt)+) $op:tt} $dup:tt $(,)?) => { + $crate::__fancy_ensure!($($lhs)+, $op, $($rhs)+) + }; + + // low precedence control flow constructs + + (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt return $($rest:tt)*) => { + $crate::__fallback_ensure!($($bail)*) + }; + + (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt break $($rest:tt)*) => { + $crate::__fallback_ensure!($($bail)*) + }; + + (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt continue $($rest:tt)*) => { + $crate::__fallback_ensure!($($bail)*) + }; + + (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt yield $($rest:tt)*) => { + $crate::__fallback_ensure!($($bail)*) + }; + + (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt move $($rest:tt)*) => { + $crate::__fallback_ensure!($($bail)*) + }; + + // unary operators + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($deref:tt $($dup:tt)*) * $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $deref) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($not:tt $($dup:tt)*) ! $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $not) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($neg:tt $($dup:tt)*) - $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $neg) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($let:tt $($dup:tt)*) let $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $let) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($life:tt $colon:tt $($dup:tt)*) $label:lifetime : $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $life $colon) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $mut:tt $($dup:tt)*) &mut $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $and $mut) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) & $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($andand:tt $mut:tt $($dup:tt)*) &&mut $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $andand $mut) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($andand:tt $($dup:tt)*) && $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $andand) $($parse)*} ($($rest)*) $($rest)*) + }; + + // control flow constructs + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($if:tt $($dup:tt)*) if $($rest:tt)*) => { + $crate::__parse_ensure!(0 (cond $stack) $bail ($($fuel)*) {($($buf)* $if) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($match:tt $($dup:tt)*) match $($rest:tt)*) => { + $crate::__parse_ensure!(0 (cond $stack) $bail ($($fuel)*) {($($buf)* $match) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($while:tt $($dup:tt)*) while $($rest:tt)*) => { + $crate::__parse_ensure!(0 (cond $stack) $bail ($($fuel)*) {($($buf)* $while) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($for:tt $($dup:tt)*) for $($rest:tt)*) => { + $crate::__parse_ensure!(pat (cond $stack) $bail ($($fuel)*) {($($buf)* $for) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom (cond $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($block:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(cond $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*) + }; + + (cond $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($else:tt $if:tt $($dup:tt)*) else if $($rest:tt)*) => { + $crate::__parse_ensure!(0 (cond $stack) $bail ($($fuel)*) {($($buf)* $else $if) $($parse)*} ($($rest)*) $($rest)*) + }; + + (cond $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($else:tt $brace:tt $($dup:tt)*) else {$($block:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $else $brace) $($parse)*} ($($rest)*) $($rest)*) + }; + + (cond $stack:tt $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) $parse $dup $($rest)*) + }; + + // atomic expressions + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($content:tt)*) $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bracket:tt $($dup:tt)*) [$($array:tt)*] $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $bracket) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($block:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($loop:tt $block:tt $($dup:tt)*) loop {$($body:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $loop $block) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($async:tt $block:tt $($dup:tt)*) async {$($body:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $async $block) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($async:tt $move:tt $block:tt $($dup:tt)*) async move {$($body:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $async $move $block) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($unsafe:tt $block:tt $($dup:tt)*) unsafe {$($body:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $unsafe $block) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $lit:literal $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $lit) $($parse)*} ($($rest)*) $($rest)*) + }; + + // path expressions + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(epath (atom $stack) $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(epath (atom $stack) $bail ($($fuel)*) {($($buf)* $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($langle:tt $($dup:tt)*) < $($rest:tt)*) => { + $crate::__parse_ensure!(type (qpath (epath (atom $stack))) $bail ($($fuel)*) {($($buf)* $langle) $($parse)*} ($($rest)*) $($rest)*) + }; + + (epath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $langle:tt $($dup:tt)*) :: < $($rest:tt)*) => { + $crate::__parse_ensure!(generic (epath $stack) $bail ($($fuel)*) {($($buf)* $colons $langle) $($parse)*} ($($rest)*) $($rest)*) + }; + + (epath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: << $($rest:tt)*) => { + $crate::__parse_ensure!(generic (epath $stack) $bail ($($fuel)*) {($($buf)* $colons <) $($parse)*} (< $($rest)*) < $($rest)*) + }; + + (epath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: <- $($rest:tt)*) => { + $crate::__parse_ensure!(generic (epath $stack) $bail ($($fuel)*) {($($buf)* $colons <) $($parse)*} (- $($rest)*) - $($rest)*) + }; + + (epath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(epath $stack $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (epath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! ($($mac:tt)*) $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*) + }; + + (epath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! [$($mac:tt)*] $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*) + }; + + (epath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! {$($mac:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*) + }; + + (epath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) $parse $dup $($rest)*) + }; + + // trailer expressions + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($call:tt)*) $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bracket:tt $($dup:tt)*) [$($index:tt)*] $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $bracket) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($init:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($question:tt $($dup:tt)*) ? $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $question) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $ident:tt $colons:tt $langle:tt $($dup:tt)*) . $i:ident :: < $($rest:tt)*) => { + $crate::__parse_ensure!(generic (atom $stack) $bail ($($fuel)*) {($($buf)* $dot $ident $colons $langle) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $ident:tt $colons:tt $($dup:tt)*) . $i:ident :: << $($rest:tt)*) => { + $crate::__parse_ensure!(generic (atom $stack) $bail ($($fuel)*) {($($buf)* $dot $ident $colons <) $($parse)*} (< $($rest)*) < $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $ident:tt $colons:tt $($dup:tt)*) . $i:ident :: <- $($rest:tt)*) => { + $crate::__parse_ensure!(generic (atom $stack) $bail ($($fuel)*) {($($buf)* $dot $ident $colons <) $($parse)*} (- $($rest)*) - $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $($dup:tt)*) . $field:ident $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $dot $field) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $index:tt $($dup:tt)*) . $lit:literal $($rest:tt)*) => { + $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $dot $index) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($as:tt $($dup:tt)*) as $($rest:tt)*) => { + $crate::__parse_ensure!(type (atom $stack) $bail ($($fuel)*) {($($buf)* $as) $($parse)*} ($($rest)*) $($rest)*) + }; + + // types + + (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bracket:tt $($dup:tt)*) [$($content:tt)*] $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bracket) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($content:tt)*) $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($star:tt $const:tt $($dup:tt)*) *const $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $star $const) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($star:tt $mut:tt $($dup:tt)*) *mut $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $star $mut) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $life:lifetime $mut:tt $($dup:tt)*) & $l:lifetime mut $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $life $mut) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $mut:tt $($dup:tt)*) & mut $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $mut) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $life:lifetime $($dup:tt)*) & $l:lifetime $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $life) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) & $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $life:lifetime $mut:tt $($dup:tt)*) && $l:lifetime mut $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $life $mut) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $mut:tt $($dup:tt)*) && mut $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $mut) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $life:lifetime $($dup:tt)*) && $l:lifetime $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $life) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) && $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($unsafe:tt $(extern $($abi:literal)?)? fn $($dup:tt)*) unsafe $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $unsafe) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($extern:tt $abi:literal fn $($dup:tt)*) extern $lit:literal $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $extern $abi) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($extern:tt fn $($dup:tt)*) extern $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $extern) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($fn:tt $paren:tt $arrow:tt $($dup:tt)*) fn ($($args:tt)*) -> $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $fn $paren $arrow) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($fn:tt $paren:tt $($dup:tt)*) fn ($($args:tt)*) $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $fn $paren) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($impl:tt $($dup:tt)*) impl $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $impl) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dyn:tt $($dup:tt)*) dyn $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $dyn) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($wild:tt $($dup:tt)*) _ $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $wild) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($never:tt $($dup:tt)*) ! $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $never) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($for:tt $langle:tt $($dup:tt)*) for < $($rest:tt)*) => { + $crate::__parse_ensure!(generic (type $stack) $bail ($($fuel)*) {($($buf)* $for $langle) $($parse)*} ($($rest)*) $($rest)*) + }; + + // path types + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(tpath $stack $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(tpath $stack $bail ($($fuel)*) {($($buf)* $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($langle:tt $($dup:tt)*) < $($rest:tt)*) => { + $crate::__parse_ensure!(type (qpath (tpath $stack)) $bail ($($fuel)*) {($($buf)* $langle) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($langle:tt $($dup:tt)*) < $($rest:tt)*) => { + $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* $langle) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt << $($rest:tt)*) => { + $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* <) $($parse)*} (< $($rest)*) < $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt <- $($rest:tt)*) => { + $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* <) $($parse)*} (- $($rest)*) - $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $langle:tt $($dup:tt)*) :: < $($rest:tt)*) => { + $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* $colons $langle) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: << $($rest:tt)*) => { + $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* $colons <) $($parse)*} (< $($rest)*) < $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: <- $($rest:tt)*) => { + $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* $colons <) $($parse)*} (- $($rest)*) - $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(tpath $stack $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $arrow:tt $($dup:tt)*) ($($args:tt)*) -> $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $paren $arrow) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($args:tt)*) $($rest:tt)*) => { + $crate::__parse_ensure!(object $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $paren:tt $arrow:tt $($dup:tt)*) :: ($($args:tt)*) -> $($rest:tt)*) => { + $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $colons $paren $arrow) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $paren:tt $($dup:tt)*) :: ($($args:tt)*) $($rest:tt)*) => { + $crate::__parse_ensure!(object $stack $bail ($($fuel)*) {($($buf)* $colons $paren) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! ($($mac:tt)*) $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! [$($mac:tt)*] $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! {$($mac:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*) + }; + + (tpath $stack:tt $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => { + $crate::__parse_ensure!(object $stack $bail ($($fuel)*) $parse $dup $($rest)*) + }; + + // qualified paths + + (qpath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($rangle:tt $colons:tt $($dup:tt)*) > :: $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $rangle $colons $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (qpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($as:tt $($dup:tt)*) as $($rest:tt)*) => { + $crate::__parse_ensure!(type (qpath $stack) $bail ($($fuel)*) {($($buf)* $as) $($parse)*} ($($rest)*) $($rest)*) + }; + + // trait objects + + (object (arglist $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($plus:tt $colons:tt $($dup:tt)*) + :: $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(tpath (arglist $stack) $bail ($($fuel)*) {($($buf)* $plus $colons $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (object (arglist $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($plus:tt $($dup:tt)*) + $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(tpath (arglist $stack) $bail ($($fuel)*) {($($buf)* $plus $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (object ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) $parse $dup $($rest)*) + }; + + // angle bracketed generic arguments + + (generic ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($rangle:tt $($dup:tt)*) > $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $rangle) $($parse)*} ($($rest)*) $($rest)*) + }; + + (generic ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt >> $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* >) $($parse)*} (> $($rest)*) > $($rest)*) + }; + + (generic $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $lit:literal $($rest:tt)*) => { + $crate::__parse_ensure!(arglist $stack $bail ($($fuel)*) {($($buf)* $lit) $($parse)*} ($($rest)*) $($rest)*) + }; + + (generic $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($block:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(arglist $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*) + }; + + (generic $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $life:lifetime $($rest:tt)*) => { + $crate::__parse_ensure!(arglist $stack $bail ($($fuel)*) {($($buf)* $life) $($parse)*} ($($rest)*) $($rest)*) + }; + + (generic $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($assoc:ident $eq:tt $($dup:tt)*) $ident:ident = $($rest:tt)*) => { + $crate::__parse_ensure!(type (arglist $stack) $bail ($($fuel)*) {($($buf)* $assoc $eq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (generic $stack:tt $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => { + $crate::__parse_ensure!(type (arglist $stack) $bail ($($fuel)*) $parse $dup $($rest)*) + }; + + (arglist $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($comma:tt $($dup:tt)*) , $($rest:tt)*) => { + $crate::__parse_ensure!(generic $stack $bail ($($fuel)*) {($($buf)* $comma) $($parse)*} ($($rest)*) $($rest)*) + }; + + (arglist ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($rangle:tt $($dup:tt)*) > $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $rangle) $($parse)*} ($($rest)*) $($rest)*) + }; + + (arglist ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt >> $($rest:tt)*) => { + $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* >) $($parse)*} (> $($rest)*) > $($rest)*) + }; + + // patterns + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($pipe:tt $($dup:tt)*) | $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $pipe) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($eq:tt $($dup:tt)*) = $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $eq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($in:tt $($dup:tt)*) in $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $in) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($ref:tt $($dup:tt)*) ref $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $ref) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($mut:tt $($dup:tt)*) mut $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $mut) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($at:tt $($dup:tt)*) @ $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $at) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $lit:literal $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $lit) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($range:tt $($dup:tt)*) .. $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $range) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($range:tt $($dup:tt)*) ..= $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $range) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) & $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($andand:tt $($dup:tt)*) && $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $andand) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($content:tt)*) $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bracket:tt $($dup:tt)*) [$($content:tt)*] $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $bracket) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($content:tt)*} $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($wild:tt $($dup:tt)*) _ $($rest:tt)*) => { + $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $wild) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(epath (pat $stack) $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $ident:ident $($rest:tt)*) => { + $crate::__parse_ensure!(epath (pat $stack) $bail ($($fuel)*) {($($buf)* $ident) $($parse)*} ($($rest)*) $($rest)*) + }; + + (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($langle:tt $($dup:tt)*) < $($rest:tt)*) => { + $crate::__parse_ensure!(type (qpath (epath (pat $stack))) $bail ($($fuel)*) {($($buf)* $langle) $($parse)*} ($($rest)*) $($rest)*) + }; + + // high precedence binary operators + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($add:tt $($dup:tt)*) + $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $add) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($sub:tt $($dup:tt)*) - $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $sub) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($mul:tt $($dup:tt)*) * $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $mul) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($div:tt $($dup:tt)*) / $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $div) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($rem:tt $($dup:tt)*) % $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $rem) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitxor:tt $($dup:tt)*) ^ $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $bitxor) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitand:tt $($dup:tt)*) & $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $bitand) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitor:tt $($dup:tt)*) | $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $bitor) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($shl:tt $($dup:tt)*) << $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $shl) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($shr:tt $($dup:tt)*) >> $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $shr) $($parse)*} ($($rest)*) $($rest)*) + }; + + // comparison binary operators + + (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($eq:tt $($dup:tt)*) == $($rest:tt)*) => { + $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $eq} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($eq:tt $($dup:tt)*) == $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $eq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($le:tt $($dup:tt)*) <= $($rest:tt)*) => { + $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $le} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($le:tt $($dup:tt)*) <= $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $le) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($lt:tt $($dup:tt)*) < $($rest:tt)*) => { + $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $lt} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($lt:tt $($dup:tt)*) < $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $lt) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($ne:tt $($dup:tt)*) != $($rest:tt)*) => { + $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $ne} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($ne:tt $($dup:tt)*) != $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $ne) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($ge:tt $($dup:tt)*) >= $($rest:tt)*) => { + $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $ge} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($ge:tt $($dup:tt)*) >= $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $ge) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($gt:tt $($dup:tt)*) > $($rest:tt)*) => { + $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $gt} ($($rest)*) $($rest)*) + }; + + (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($gt:tt $($dup:tt)*) > $($rest:tt)*) => { + $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $gt) $($parse)*} ($($rest)*) $($rest)*) + }; + + // low precedence binary operators + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) && $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($or:tt $($dup:tt)*) || $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $or) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($assign:tt $($dup:tt)*) = $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $assign) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($addeq:tt $($dup:tt)*) += $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $addeq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($subeq:tt $($dup:tt)*) -= $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $subeq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($muleq:tt $($dup:tt)*) *= $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $muleq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($diveq:tt $($dup:tt)*) /= $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $diveq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($remeq:tt $($dup:tt)*) %= $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $remeq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitxoreq:tt $($dup:tt)*) ^= $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $bitxoreq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitandeq:tt $($dup:tt)*) &= $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $bitandeq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitoreq:tt $($dup:tt)*) |= $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $bitoreq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($shleq:tt $($dup:tt)*) <<= $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $shleq) $($parse)*} ($($rest)*) $($rest)*) + }; + + (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($shreq:tt $($dup:tt)*) >>= $($rest:tt)*) => { + $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $shreq) $($parse)*} ($($rest)*) $($rest)*) + }; + + // unrecognized expression + + ($state:tt $stack:tt ($($bail:tt)*) $($rest:tt)*) => { + $crate::__fallback_ensure!($($bail)*) + }; +} + +#[doc(hidden)] +#[macro_export] +macro_rules! __fancy_ensure { + ($lhs:expr, $op:tt, $rhs:expr) => { + match (&$lhs, &$rhs) { + (lhs, rhs) => { + if !(lhs $op rhs) { + #[allow(unused_imports)] + use $crate::__private::{BothDebug, NotBothDebug}; + return Err((lhs, rhs).__dispatch_ensure( + $crate::__private::concat!( + "Condition failed: `", + $crate::__private::stringify!($lhs), + " ", + $crate::__private::stringify!($op), + " ", + $crate::__private::stringify!($rhs), + "`", + ), + )); + } + } + } + }; +} + +#[doc(hidden)] +#[macro_export] +macro_rules! __fallback_ensure { + ($cond:expr $(,)?) => { + if !$cond { + return $crate::__private::Err($crate::Error::msg( + $crate::__private::concat!("Condition failed: `", $crate::__private::stringify!($cond), "`") + )); + } + }; + ($cond:expr, $msg:literal $(,)?) => { + if !$cond { + return $crate::__private::Err($crate::__anyhow!($msg)); + } + }; + ($cond:expr, $err:expr $(,)?) => { + if !$cond { + return $crate::__private::Err($crate::__anyhow!($err)); + } + }; + ($cond:expr, $fmt:expr, $($arg:tt)*) => { + if !$cond { + return $crate::__private::Err($crate::__anyhow!($fmt, $($arg)*)); + } + }; +} diff --git a/third_party/rust/anyhow/src/error.rs b/third_party/rust/anyhow/src/error.rs new file mode 100644 index 0000000000..9f6ce8c10b --- /dev/null +++ b/third_party/rust/anyhow/src/error.rs @@ -0,0 +1,992 @@ +use crate::backtrace::Backtrace; +use crate::chain::Chain; +#[cfg(any(feature = "std", anyhow_no_ptr_addr_of))] +use crate::ptr::Mut; +use crate::ptr::{Own, Ref}; +use crate::{Error, StdError}; +use alloc::boxed::Box; +#[cfg(backtrace)] +use core::any::Demand; +use core::any::TypeId; +use core::fmt::{self, Debug, Display}; +use core::mem::ManuallyDrop; +#[cfg(not(anyhow_no_ptr_addr_of))] +use core::ptr; +use core::ptr::NonNull; + +#[cfg(feature = "std")] +use core::ops::{Deref, DerefMut}; + +impl Error { + /// Create a new error object from any error type. + /// + /// The error type must be threadsafe and `'static`, so that the `Error` + /// will be as well. + /// + /// If the error type does not provide a backtrace, a backtrace will be + /// created here to ensure that a backtrace exists. + #[cfg(feature = "std")] + #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] + #[cold] + #[must_use] + pub fn new(error: E) -> Self + where + E: StdError + Send + Sync + 'static, + { + let backtrace = backtrace_if_absent!(&error); + Error::from_std(error, backtrace) + } + + /// Create a new error object from a printable error message. + /// + /// If the argument implements std::error::Error, prefer `Error::new` + /// instead which preserves the underlying error's cause chain and + /// backtrace. If the argument may or may not implement std::error::Error + /// now or in the future, use `anyhow!(err)` which handles either way + /// correctly. + /// + /// `Error::msg("...")` is equivalent to `anyhow!("...")` but occasionally + /// convenient in places where a function is preferable over a macro, such + /// as iterator or stream combinators: + /// + /// ``` + /// # mod ffi { + /// # pub struct Input; + /// # pub struct Output; + /// # pub async fn do_some_work(_: Input) -> Result { + /// # unimplemented!() + /// # } + /// # } + /// # + /// # use ffi::{Input, Output}; + /// # + /// use anyhow::{Error, Result}; + /// use futures::stream::{Stream, StreamExt, TryStreamExt}; + /// + /// async fn demo(stream: S) -> Result> + /// where + /// S: Stream, + /// { + /// stream + /// .then(ffi::do_some_work) // returns Result + /// .map_err(Error::msg) + /// .try_collect() + /// .await + /// } + /// ``` + #[cold] + #[must_use] + pub fn msg(message: M) -> Self + where + M: Display + Debug + Send + Sync + 'static, + { + Error::from_adhoc(message, backtrace!()) + } + + #[cfg(feature = "std")] + #[cold] + pub(crate) fn from_std(error: E, backtrace: Option) -> Self + where + E: StdError + Send + Sync + 'static, + { + let vtable = &ErrorVTable { + object_drop: object_drop::, + object_ref: object_ref::, + #[cfg(anyhow_no_ptr_addr_of)] + object_mut: object_mut::, + object_boxed: object_boxed::, + object_downcast: object_downcast::, + #[cfg(anyhow_no_ptr_addr_of)] + object_downcast_mut: object_downcast_mut::, + object_drop_rest: object_drop_front::, + #[cfg(all(not(backtrace), feature = "backtrace"))] + object_backtrace: no_backtrace, + }; + + // Safety: passing vtable that operates on the right type E. + unsafe { Error::construct(error, vtable, backtrace) } + } + + #[cold] + pub(crate) fn from_adhoc(message: M, backtrace: Option) -> Self + where + M: Display + Debug + Send + Sync + 'static, + { + use crate::wrapper::MessageError; + let error: MessageError = MessageError(message); + let vtable = &ErrorVTable { + object_drop: object_drop::>, + object_ref: object_ref::>, + #[cfg(all(feature = "std", anyhow_no_ptr_addr_of))] + object_mut: object_mut::>, + object_boxed: object_boxed::>, + object_downcast: object_downcast::, + #[cfg(anyhow_no_ptr_addr_of)] + object_downcast_mut: object_downcast_mut::, + object_drop_rest: object_drop_front::, + #[cfg(all(not(backtrace), feature = "backtrace"))] + object_backtrace: no_backtrace, + }; + + // Safety: MessageError is repr(transparent) so it is okay for the + // vtable to allow casting the MessageError to M. + unsafe { Error::construct(error, vtable, backtrace) } + } + + #[cold] + pub(crate) fn from_display(message: M, backtrace: Option) -> Self + where + M: Display + Send + Sync + 'static, + { + use crate::wrapper::DisplayError; + let error: DisplayError = DisplayError(message); + let vtable = &ErrorVTable { + object_drop: object_drop::>, + object_ref: object_ref::>, + #[cfg(all(feature = "std", anyhow_no_ptr_addr_of))] + object_mut: object_mut::>, + object_boxed: object_boxed::>, + object_downcast: object_downcast::, + #[cfg(anyhow_no_ptr_addr_of)] + object_downcast_mut: object_downcast_mut::, + object_drop_rest: object_drop_front::, + #[cfg(all(not(backtrace), feature = "backtrace"))] + object_backtrace: no_backtrace, + }; + + // Safety: DisplayError is repr(transparent) so it is okay for the + // vtable to allow casting the DisplayError to M. + unsafe { Error::construct(error, vtable, backtrace) } + } + + #[cfg(feature = "std")] + #[cold] + pub(crate) fn from_context(context: C, error: E, backtrace: Option) -> Self + where + C: Display + Send + Sync + 'static, + E: StdError + Send + Sync + 'static, + { + let error: ContextError = ContextError { context, error }; + + let vtable = &ErrorVTable { + object_drop: object_drop::>, + object_ref: object_ref::>, + #[cfg(anyhow_no_ptr_addr_of)] + object_mut: object_mut::>, + object_boxed: object_boxed::>, + object_downcast: context_downcast::, + #[cfg(anyhow_no_ptr_addr_of)] + object_downcast_mut: context_downcast_mut::, + object_drop_rest: context_drop_rest::, + #[cfg(all(not(backtrace), feature = "backtrace"))] + object_backtrace: no_backtrace, + }; + + // Safety: passing vtable that operates on the right type. + unsafe { Error::construct(error, vtable, backtrace) } + } + + #[cfg(feature = "std")] + #[cold] + pub(crate) fn from_boxed( + error: Box, + backtrace: Option, + ) -> Self { + use crate::wrapper::BoxedError; + let error = BoxedError(error); + let vtable = &ErrorVTable { + object_drop: object_drop::, + object_ref: object_ref::, + #[cfg(anyhow_no_ptr_addr_of)] + object_mut: object_mut::, + object_boxed: object_boxed::, + object_downcast: object_downcast::>, + #[cfg(anyhow_no_ptr_addr_of)] + object_downcast_mut: object_downcast_mut::>, + object_drop_rest: object_drop_front::>, + #[cfg(all(not(backtrace), feature = "backtrace"))] + object_backtrace: no_backtrace, + }; + + // Safety: BoxedError is repr(transparent) so it is okay for the vtable + // to allow casting to Box. + unsafe { Error::construct(error, vtable, backtrace) } + } + + // Takes backtrace as argument rather than capturing it here so that the + // user sees one fewer layer of wrapping noise in the backtrace. + // + // Unsafe because the given vtable must have sensible behavior on the error + // value of type E. + #[cold] + unsafe fn construct( + error: E, + vtable: &'static ErrorVTable, + backtrace: Option, + ) -> Self + where + E: StdError + Send + Sync + 'static, + { + let inner: Box> = Box::new(ErrorImpl { + vtable, + backtrace, + _object: error, + }); + // Erase the concrete type of E from the compile-time type system. This + // is equivalent to the safe unsize coercion from Box> to + // Box> except that the + // result is a thin pointer. The necessary behavior for manipulating the + // underlying ErrorImpl is preserved in the vtable provided by the + // caller rather than a builtin fat pointer vtable. + let inner = Own::new(inner).cast::(); + Error { inner } + } + + /// Wrap the error value with additional context. + /// + /// For attaching context to a `Result` as it is propagated, the + /// [`Context`][crate::Context] extension trait may be more convenient than + /// this function. + /// + /// The primary reason to use `error.context(...)` instead of + /// `result.context(...)` via the `Context` trait would be if the context + /// needs to depend on some data held by the underlying error: + /// + /// ``` + /// # use std::fmt::{self, Debug, Display}; + /// # + /// # type T = (); + /// # + /// # impl std::error::Error for ParseError {} + /// # impl Debug for ParseError { + /// # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + /// # unimplemented!() + /// # } + /// # } + /// # impl Display for ParseError { + /// # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + /// # unimplemented!() + /// # } + /// # } + /// # + /// use anyhow::Result; + /// use std::fs::File; + /// use std::path::Path; + /// + /// struct ParseError { + /// line: usize, + /// column: usize, + /// } + /// + /// fn parse_impl(file: File) -> Result { + /// # const IGNORE: &str = stringify! { + /// ... + /// # }; + /// # unimplemented!() + /// } + /// + /// pub fn parse(path: impl AsRef) -> Result { + /// let file = File::open(&path)?; + /// parse_impl(file).map_err(|error| { + /// let context = format!( + /// "only the first {} lines of {} are valid", + /// error.line, path.as_ref().display(), + /// ); + /// anyhow::Error::new(error).context(context) + /// }) + /// } + /// ``` + #[cold] + #[must_use] + pub fn context(self, context: C) -> Self + where + C: Display + Send + Sync + 'static, + { + let error: ContextError = ContextError { + context, + error: self, + }; + + let vtable = &ErrorVTable { + object_drop: object_drop::>, + object_ref: object_ref::>, + #[cfg(all(feature = "std", anyhow_no_ptr_addr_of))] + object_mut: object_mut::>, + object_boxed: object_boxed::>, + object_downcast: context_chain_downcast::, + #[cfg(anyhow_no_ptr_addr_of)] + object_downcast_mut: context_chain_downcast_mut::, + object_drop_rest: context_chain_drop_rest::, + #[cfg(all(not(backtrace), feature = "backtrace"))] + object_backtrace: context_backtrace::, + }; + + // As the cause is anyhow::Error, we already have a backtrace for it. + let backtrace = None; + + // Safety: passing vtable that operates on the right type. + unsafe { Error::construct(error, vtable, backtrace) } + } + + /// Get the backtrace for this Error. + /// + /// In order for the backtrace to be meaningful, one of the two environment + /// variables `RUST_LIB_BACKTRACE=1` or `RUST_BACKTRACE=1` must be defined + /// and `RUST_LIB_BACKTRACE` must not be `0`. Backtraces are somewhat + /// expensive to capture in Rust, so we don't necessarily want to be + /// capturing them all over the place all the time. + /// + /// - If you want panics and errors to both have backtraces, set + /// `RUST_BACKTRACE=1`; + /// - If you want only errors to have backtraces, set + /// `RUST_LIB_BACKTRACE=1`; + /// - If you want only panics to have backtraces, set `RUST_BACKTRACE=1` and + /// `RUST_LIB_BACKTRACE=0`. + /// + /// # Stability + /// + /// Standard library backtraces are only available on the nightly channel. + /// Tracking issue: [rust-lang/rust#53487][tracking]. + /// + /// On stable compilers, this function is only available if the crate's + /// "backtrace" feature is enabled, and will use the `backtrace` crate as + /// the underlying backtrace implementation. + /// + /// ```toml + /// [dependencies] + /// anyhow = { version = "1.0", features = ["backtrace"] } + /// ``` + /// + /// [tracking]: https://github.com/rust-lang/rust/issues/53487 + #[cfg(any(backtrace, feature = "backtrace"))] + #[cfg_attr(doc_cfg, doc(cfg(any(nightly, feature = "backtrace"))))] + pub fn backtrace(&self) -> &impl_backtrace!() { + unsafe { ErrorImpl::backtrace(self.inner.by_ref()) } + } + + /// An iterator of the chain of source errors contained by this Error. + /// + /// This iterator will visit every error in the cause chain of this error + /// object, beginning with the error that this error object was created + /// from. + /// + /// # Example + /// + /// ``` + /// use anyhow::Error; + /// use std::io; + /// + /// pub fn underlying_io_error_kind(error: &Error) -> Option { + /// for cause in error.chain() { + /// if let Some(io_error) = cause.downcast_ref::() { + /// return Some(io_error.kind()); + /// } + /// } + /// None + /// } + /// ``` + #[cfg(feature = "std")] + #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] + #[cold] + pub fn chain(&self) -> Chain { + unsafe { ErrorImpl::chain(self.inner.by_ref()) } + } + + /// The lowest level cause of this error — this error's cause's + /// cause's cause etc. + /// + /// The root cause is the last error in the iterator produced by + /// [`chain()`][Error::chain]. + #[cfg(feature = "std")] + #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] + pub fn root_cause(&self) -> &(dyn StdError + 'static) { + self.chain().last().unwrap() + } + + /// Returns true if `E` is the type held by this error object. + /// + /// For errors with context, this method returns true if `E` matches the + /// type of the context `C` **or** the type of the error on which the + /// context has been attached. For details about the interaction between + /// context and downcasting, [see here]. + /// + /// [see here]: trait.Context.html#effect-on-downcasting + pub fn is(&self) -> bool + where + E: Display + Debug + Send + Sync + 'static, + { + self.downcast_ref::().is_some() + } + + /// Attempt to downcast the error object to a concrete type. + pub fn downcast(mut self) -> Result + where + E: Display + Debug + Send + Sync + 'static, + { + let target = TypeId::of::(); + let inner = self.inner.by_mut(); + unsafe { + // Use vtable to find NonNull<()> which points to a value of type E + // somewhere inside the data structure. + #[cfg(not(anyhow_no_ptr_addr_of))] + let addr = match (vtable(inner.ptr).object_downcast)(inner.by_ref(), target) { + Some(addr) => addr.by_mut().extend(), + None => return Err(self), + }; + #[cfg(anyhow_no_ptr_addr_of)] + let addr = match (vtable(inner.ptr).object_downcast_mut)(inner, target) { + Some(addr) => addr.extend(), + None => return Err(self), + }; + + // Prepare to read E out of the data structure. We'll drop the rest + // of the data structure separately so that E is not dropped. + let outer = ManuallyDrop::new(self); + + // Read E from where the vtable found it. + let error = addr.cast::().read(); + + // Drop rest of the data structure outside of E. + (vtable(outer.inner.ptr).object_drop_rest)(outer.inner, target); + + Ok(error) + } + } + + /// Downcast this error object by reference. + /// + /// # Example + /// + /// ``` + /// # use anyhow::anyhow; + /// # use std::fmt::{self, Display}; + /// # use std::task::Poll; + /// # + /// # #[derive(Debug)] + /// # enum DataStoreError { + /// # Censored(()), + /// # } + /// # + /// # impl Display for DataStoreError { + /// # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + /// # unimplemented!() + /// # } + /// # } + /// # + /// # impl std::error::Error for DataStoreError {} + /// # + /// # const REDACTED_CONTENT: () = (); + /// # + /// # let error = anyhow!("..."); + /// # let root_cause = &error; + /// # + /// # let ret = + /// // If the error was caused by redaction, then return a tombstone instead + /// // of the content. + /// match root_cause.downcast_ref::() { + /// Some(DataStoreError::Censored(_)) => Ok(Poll::Ready(REDACTED_CONTENT)), + /// None => Err(error), + /// } + /// # ; + /// ``` + pub fn downcast_ref(&self) -> Option<&E> + where + E: Display + Debug + Send + Sync + 'static, + { + let target = TypeId::of::(); + unsafe { + // Use vtable to find NonNull<()> which points to a value of type E + // somewhere inside the data structure. + let addr = (vtable(self.inner.ptr).object_downcast)(self.inner.by_ref(), target)?; + Some(addr.cast::().deref()) + } + } + + /// Downcast this error object by mutable reference. + pub fn downcast_mut(&mut self) -> Option<&mut E> + where + E: Display + Debug + Send + Sync + 'static, + { + let target = TypeId::of::(); + unsafe { + // Use vtable to find NonNull<()> which points to a value of type E + // somewhere inside the data structure. + + #[cfg(not(anyhow_no_ptr_addr_of))] + let addr = + (vtable(self.inner.ptr).object_downcast)(self.inner.by_ref(), target)?.by_mut(); + + #[cfg(anyhow_no_ptr_addr_of)] + let addr = (vtable(self.inner.ptr).object_downcast_mut)(self.inner.by_mut(), target)?; + + Some(addr.cast::().deref_mut()) + } + } +} + +#[cfg(backtrace)] +impl std::any::Provider for Error { + // Called by thiserror when you have `#[source] anyhow::Error`. This provide + // implementation includes the anyhow::Error's Backtrace if any, unlike + // deref'ing to dyn Error where the provide implementation would include + // only the original error's Backtrace from before it got wrapped into an + // anyhow::Error. + fn provide<'a>(&'a self, demand: &mut Demand<'a>) { + unsafe { ErrorImpl::provide(self.inner.by_ref(), demand) } + } +} + +#[cfg(feature = "std")] +#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] +impl From for Error +where + E: StdError + Send + Sync + 'static, +{ + #[cold] + fn from(error: E) -> Self { + let backtrace = backtrace_if_absent!(&error); + Error::from_std(error, backtrace) + } +} + +#[cfg(feature = "std")] +#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] +impl Deref for Error { + type Target = dyn StdError + Send + Sync + 'static; + + fn deref(&self) -> &Self::Target { + unsafe { ErrorImpl::error(self.inner.by_ref()) } + } +} + +#[cfg(feature = "std")] +#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] +impl DerefMut for Error { + fn deref_mut(&mut self) -> &mut Self::Target { + unsafe { ErrorImpl::error_mut(self.inner.by_mut()) } + } +} + +impl Display for Error { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + unsafe { ErrorImpl::display(self.inner.by_ref(), formatter) } + } +} + +impl Debug for Error { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + unsafe { ErrorImpl::debug(self.inner.by_ref(), formatter) } + } +} + +impl Drop for Error { + fn drop(&mut self) { + unsafe { + // Invoke the vtable's drop behavior. + (vtable(self.inner.ptr).object_drop)(self.inner); + } + } +} + +struct ErrorVTable { + object_drop: unsafe fn(Own), + object_ref: unsafe fn(Ref) -> Ref, + #[cfg(all(feature = "std", anyhow_no_ptr_addr_of))] + object_mut: unsafe fn(Mut) -> &mut (dyn StdError + Send + Sync + 'static), + object_boxed: unsafe fn(Own) -> Box, + object_downcast: unsafe fn(Ref, TypeId) -> Option>, + #[cfg(anyhow_no_ptr_addr_of)] + object_downcast_mut: unsafe fn(Mut, TypeId) -> Option>, + object_drop_rest: unsafe fn(Own, TypeId), + #[cfg(all(not(backtrace), feature = "backtrace"))] + object_backtrace: unsafe fn(Ref) -> Option<&Backtrace>, +} + +// Safety: requires layout of *e to match ErrorImpl. +unsafe fn object_drop(e: Own) { + // Cast back to ErrorImpl so that the allocator receives the correct + // Layout to deallocate the Box's memory. + let unerased = e.cast::>().boxed(); + drop(unerased); +} + +// Safety: requires layout of *e to match ErrorImpl. +unsafe fn object_drop_front(e: Own, target: TypeId) { + // Drop the fields of ErrorImpl other than E as well as the Box allocation, + // without dropping E itself. This is used by downcast after doing a + // ptr::read to take ownership of the E. + let _ = target; + let unerased = e.cast::>>().boxed(); + drop(unerased); +} + +// Safety: requires layout of *e to match ErrorImpl. +unsafe fn object_ref(e: Ref) -> Ref +where + E: StdError + Send + Sync + 'static, +{ + // Attach E's native StdError vtable onto a pointer to self._object. + + let unerased = e.cast::>(); + + #[cfg(not(anyhow_no_ptr_addr_of))] + return Ref::from_raw(NonNull::new_unchecked( + ptr::addr_of!((*unerased.as_ptr())._object) as *mut E, + )); + + #[cfg(anyhow_no_ptr_addr_of)] + return Ref::new(&unerased.deref()._object); +} + +// Safety: requires layout of *e to match ErrorImpl, and for `e` to be derived +// from a `&mut` +#[cfg(all(feature = "std", anyhow_no_ptr_addr_of))] +unsafe fn object_mut(e: Mut) -> &mut (dyn StdError + Send + Sync + 'static) +where + E: StdError + Send + Sync + 'static, +{ + // Attach E's native StdError vtable onto a pointer to self._object. + &mut e.cast::>().deref_mut()._object +} + +// Safety: requires layout of *e to match ErrorImpl. +unsafe fn object_boxed(e: Own) -> Box +where + E: StdError + Send + Sync + 'static, +{ + // Attach ErrorImpl's native StdError vtable. The StdError impl is below. + e.cast::>().boxed() +} + +// Safety: requires layout of *e to match ErrorImpl. +unsafe fn object_downcast(e: Ref, target: TypeId) -> Option> +where + E: 'static, +{ + if TypeId::of::() == target { + // Caller is looking for an E pointer and e is ErrorImpl, take a + // pointer to its E field. + + let unerased = e.cast::>(); + + #[cfg(not(anyhow_no_ptr_addr_of))] + return Some( + Ref::from_raw(NonNull::new_unchecked( + ptr::addr_of!((*unerased.as_ptr())._object) as *mut E, + )) + .cast::<()>(), + ); + + #[cfg(anyhow_no_ptr_addr_of)] + return Some(Ref::new(&unerased.deref()._object).cast::<()>()); + } else { + None + } +} + +// Safety: requires layout of *e to match ErrorImpl. +#[cfg(anyhow_no_ptr_addr_of)] +unsafe fn object_downcast_mut(e: Mut, target: TypeId) -> Option> +where + E: 'static, +{ + if TypeId::of::() == target { + // Caller is looking for an E pointer and e is ErrorImpl, take a + // pointer to its E field. + let unerased = e.cast::>().deref_mut(); + Some(Mut::new(&mut unerased._object).cast::<()>()) + } else { + None + } +} + +#[cfg(all(not(backtrace), feature = "backtrace"))] +fn no_backtrace(e: Ref) -> Option<&Backtrace> { + let _ = e; + None +} + +// Safety: requires layout of *e to match ErrorImpl>. +#[cfg(feature = "std")] +unsafe fn context_downcast(e: Ref, target: TypeId) -> Option> +where + C: 'static, + E: 'static, +{ + if TypeId::of::() == target { + let unerased = e.cast::>>().deref(); + Some(Ref::new(&unerased._object.context).cast::<()>()) + } else if TypeId::of::() == target { + let unerased = e.cast::>>().deref(); + Some(Ref::new(&unerased._object.error).cast::<()>()) + } else { + None + } +} + +// Safety: requires layout of *e to match ErrorImpl>. +#[cfg(all(feature = "std", anyhow_no_ptr_addr_of))] +unsafe fn context_downcast_mut(e: Mut, target: TypeId) -> Option> +where + C: 'static, + E: 'static, +{ + if TypeId::of::() == target { + let unerased = e.cast::>>().deref_mut(); + Some(Mut::new(&mut unerased._object.context).cast::<()>()) + } else if TypeId::of::() == target { + let unerased = e.cast::>>().deref_mut(); + Some(Mut::new(&mut unerased._object.error).cast::<()>()) + } else { + None + } +} + +// Safety: requires layout of *e to match ErrorImpl>. +#[cfg(feature = "std")] +unsafe fn context_drop_rest(e: Own, target: TypeId) +where + C: 'static, + E: 'static, +{ + // Called after downcasting by value to either the C or the E and doing a + // ptr::read to take ownership of that value. + if TypeId::of::() == target { + let unerased = e + .cast::, E>>>() + .boxed(); + drop(unerased); + } else { + let unerased = e + .cast::>>>() + .boxed(); + drop(unerased); + } +} + +// Safety: requires layout of *e to match ErrorImpl>. +unsafe fn context_chain_downcast(e: Ref, target: TypeId) -> Option> +where + C: 'static, +{ + let unerased = e.cast::>>().deref(); + if TypeId::of::() == target { + Some(Ref::new(&unerased._object.context).cast::<()>()) + } else { + // Recurse down the context chain per the inner error's vtable. + let source = &unerased._object.error; + (vtable(source.inner.ptr).object_downcast)(source.inner.by_ref(), target) + } +} + +// Safety: requires layout of *e to match ErrorImpl>. +#[cfg(anyhow_no_ptr_addr_of)] +unsafe fn context_chain_downcast_mut(e: Mut, target: TypeId) -> Option> +where + C: 'static, +{ + let unerased = e.cast::>>().deref_mut(); + if TypeId::of::() == target { + Some(Mut::new(&mut unerased._object.context).cast::<()>()) + } else { + // Recurse down the context chain per the inner error's vtable. + let source = &mut unerased._object.error; + (vtable(source.inner.ptr).object_downcast_mut)(source.inner.by_mut(), target) + } +} + +// Safety: requires layout of *e to match ErrorImpl>. +unsafe fn context_chain_drop_rest(e: Own, target: TypeId) +where + C: 'static, +{ + // Called after downcasting by value to either the C or one of the causes + // and doing a ptr::read to take ownership of that value. + if TypeId::of::() == target { + let unerased = e + .cast::, Error>>>() + .boxed(); + // Drop the entire rest of the data structure rooted in the next Error. + drop(unerased); + } else { + let unerased = e + .cast::>>>() + .boxed(); + // Read the Own from the next error. + let inner = unerased._object.error.inner; + drop(unerased); + let vtable = vtable(inner.ptr); + // Recursively drop the next error using the same target typeid. + (vtable.object_drop_rest)(inner, target); + } +} + +// Safety: requires layout of *e to match ErrorImpl>. +#[cfg(all(not(backtrace), feature = "backtrace"))] +#[allow(clippy::unnecessary_wraps)] +unsafe fn context_backtrace(e: Ref) -> Option<&Backtrace> +where + C: 'static, +{ + let unerased = e.cast::>>().deref(); + let backtrace = ErrorImpl::backtrace(unerased._object.error.inner.by_ref()); + Some(backtrace) +} + +// NOTE: If working with `ErrorImpl<()>`, references should be avoided in favor +// of raw pointers and `NonNull`. +// repr C to ensure that E remains in the final position. +#[repr(C)] +pub(crate) struct ErrorImpl { + vtable: &'static ErrorVTable, + backtrace: Option, + // NOTE: Don't use directly. Use only through vtable. Erased type may have + // different alignment. + _object: E, +} + +// Reads the vtable out of `p`. This is the same as `p.as_ref().vtable`, but +// avoids converting `p` into a reference. +unsafe fn vtable(p: NonNull) -> &'static ErrorVTable { + // NOTE: This assumes that `ErrorVTable` is the first field of ErrorImpl. + *(p.as_ptr() as *const &'static ErrorVTable) +} + +// repr C to ensure that ContextError has the same layout as +// ContextError, E> and ContextError>. +#[repr(C)] +pub(crate) struct ContextError { + pub context: C, + pub error: E, +} + +impl ErrorImpl { + fn erase(&self) -> Ref { + // Erase the concrete type of E but preserve the vtable in self.vtable + // for manipulating the resulting thin pointer. This is analogous to an + // unsize coercion. + Ref::new(self).cast::() + } +} + +impl ErrorImpl { + pub(crate) unsafe fn error(this: Ref) -> &(dyn StdError + Send + Sync + 'static) { + // Use vtable to attach E's native StdError vtable for the right + // original type E. + (vtable(this.ptr).object_ref)(this).deref() + } + + #[cfg(feature = "std")] + pub(crate) unsafe fn error_mut(this: Mut) -> &mut (dyn StdError + Send + Sync + 'static) { + // Use vtable to attach E's native StdError vtable for the right + // original type E. + + #[cfg(not(anyhow_no_ptr_addr_of))] + return (vtable(this.ptr).object_ref)(this.by_ref()) + .by_mut() + .deref_mut(); + + #[cfg(anyhow_no_ptr_addr_of)] + return (vtable(this.ptr).object_mut)(this); + } + + #[cfg(any(backtrace, feature = "backtrace"))] + pub(crate) unsafe fn backtrace(this: Ref) -> &Backtrace { + // This unwrap can only panic if the underlying error's backtrace method + // is nondeterministic, which would only happen in maliciously + // constructed code. + this.deref() + .backtrace + .as_ref() + .or_else(|| { + #[cfg(backtrace)] + return Self::error(this).request_ref::(); + #[cfg(not(backtrace))] + return (vtable(this.ptr).object_backtrace)(this); + }) + .expect("backtrace capture failed") + } + + #[cfg(backtrace)] + unsafe fn provide<'a>(this: Ref<'a, Self>, demand: &mut Demand<'a>) { + if let Some(backtrace) = &this.deref().backtrace { + demand.provide_ref(backtrace); + } + Self::error(this).provide(demand); + } + + #[cold] + pub(crate) unsafe fn chain(this: Ref) -> Chain { + Chain::new(Self::error(this)) + } +} + +impl StdError for ErrorImpl +where + E: StdError, +{ + fn source(&self) -> Option<&(dyn StdError + 'static)> { + unsafe { ErrorImpl::error(self.erase()).source() } + } + + #[cfg(backtrace)] + fn provide<'a>(&'a self, demand: &mut Demand<'a>) { + unsafe { ErrorImpl::provide(self.erase(), demand) } + } +} + +impl Debug for ErrorImpl +where + E: Debug, +{ + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + unsafe { ErrorImpl::debug(self.erase(), formatter) } + } +} + +impl Display for ErrorImpl +where + E: Display, +{ + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + unsafe { Display::fmt(ErrorImpl::error(self.erase()), formatter) } + } +} + +impl From for Box { + #[cold] + fn from(error: Error) -> Self { + let outer = ManuallyDrop::new(error); + unsafe { + // Use vtable to attach ErrorImpl's native StdError vtable for + // the right original type E. + (vtable(outer.inner.ptr).object_boxed)(outer.inner) + } + } +} + +impl From for Box { + fn from(error: Error) -> Self { + Box::::from(error) + } +} + +impl From for Box { + fn from(error: Error) -> Self { + Box::::from(error) + } +} + +#[cfg(feature = "std")] +impl AsRef for Error { + fn as_ref(&self) -> &(dyn StdError + Send + Sync + 'static) { + &**self + } +} + +#[cfg(feature = "std")] +impl AsRef for Error { + fn as_ref(&self) -> &(dyn StdError + 'static) { + &**self + } +} diff --git a/third_party/rust/anyhow/src/fmt.rs b/third_party/rust/anyhow/src/fmt.rs new file mode 100644 index 0000000000..03d8fd3940 --- /dev/null +++ b/third_party/rust/anyhow/src/fmt.rs @@ -0,0 +1,155 @@ +use crate::chain::Chain; +use crate::error::ErrorImpl; +use crate::ptr::Ref; +use core::fmt::{self, Debug, Write}; + +impl ErrorImpl { + pub(crate) unsafe fn display(this: Ref, f: &mut fmt::Formatter) -> fmt::Result { + write!(f, "{}", Self::error(this))?; + + if f.alternate() { + for cause in Self::chain(this).skip(1) { + write!(f, ": {}", cause)?; + } + } + + Ok(()) + } + + pub(crate) unsafe fn debug(this: Ref, f: &mut fmt::Formatter) -> fmt::Result { + let error = Self::error(this); + + if f.alternate() { + return Debug::fmt(error, f); + } + + write!(f, "{}", error)?; + + if let Some(cause) = error.source() { + write!(f, "\n\nCaused by:")?; + let multiple = cause.source().is_some(); + for (n, error) in Chain::new(cause).enumerate() { + writeln!(f)?; + let mut indented = Indented { + inner: f, + number: if multiple { Some(n) } else { None }, + started: false, + }; + write!(indented, "{}", error)?; + } + } + + #[cfg(any(backtrace, feature = "backtrace"))] + { + use crate::backtrace::BacktraceStatus; + + let backtrace = Self::backtrace(this); + if let BacktraceStatus::Captured = backtrace.status() { + let mut backtrace = backtrace.to_string(); + write!(f, "\n\n")?; + if backtrace.starts_with("stack backtrace:") { + // Capitalize to match "Caused by:" + backtrace.replace_range(0..1, "S"); + } else { + // "stack backtrace:" prefix was removed in + // https://github.com/rust-lang/backtrace-rs/pull/286 + writeln!(f, "Stack backtrace:")?; + } + backtrace.truncate(backtrace.trim_end().len()); + write!(f, "{}", backtrace)?; + } + } + + Ok(()) + } +} + +struct Indented<'a, D> { + inner: &'a mut D, + number: Option, + started: bool, +} + +impl Write for Indented<'_, T> +where + T: Write, +{ + fn write_str(&mut self, s: &str) -> fmt::Result { + for (i, line) in s.split('\n').enumerate() { + if !self.started { + self.started = true; + match self.number { + Some(number) => write!(self.inner, "{: >5}: ", number)?, + None => self.inner.write_str(" ")?, + } + } else if i > 0 { + self.inner.write_char('\n')?; + if self.number.is_some() { + self.inner.write_str(" ")?; + } else { + self.inner.write_str(" ")?; + } + } + + self.inner.write_str(line)?; + } + + Ok(()) + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn one_digit() { + let input = "verify\nthis"; + let expected = " 2: verify\n this"; + let mut output = String::new(); + + Indented { + inner: &mut output, + number: Some(2), + started: false, + } + .write_str(input) + .unwrap(); + + assert_eq!(expected, output); + } + + #[test] + fn two_digits() { + let input = "verify\nthis"; + let expected = " 12: verify\n this"; + let mut output = String::new(); + + Indented { + inner: &mut output, + number: Some(12), + started: false, + } + .write_str(input) + .unwrap(); + + assert_eq!(expected, output); + } + + #[test] + fn no_digits() { + let input = "verify\nthis"; + let expected = " verify\n this"; + let mut output = String::new(); + + Indented { + inner: &mut output, + number: None, + started: false, + } + .write_str(input) + .unwrap(); + + assert_eq!(expected, output); + } +} diff --git a/third_party/rust/anyhow/src/kind.rs b/third_party/rust/anyhow/src/kind.rs new file mode 100644 index 0000000000..f47fe44ba2 --- /dev/null +++ b/third_party/rust/anyhow/src/kind.rs @@ -0,0 +1,116 @@ +// Tagged dispatch mechanism for resolving the behavior of `anyhow!($expr)`. +// +// When anyhow! is given a single expr argument to turn into anyhow::Error, we +// want the resulting Error to pick up the input's implementation of source() +// and backtrace() if it has a std::error::Error impl, otherwise require nothing +// more than Display and Debug. +// +// Expressed in terms of specialization, we want something like: +// +// trait AnyhowNew { +// fn new(self) -> Error; +// } +// +// impl AnyhowNew for T +// where +// T: Display + Debug + Send + Sync + 'static, +// { +// default fn new(self) -> Error { +// /* no std error impl */ +// } +// } +// +// impl AnyhowNew for T +// where +// T: std::error::Error + Send + Sync + 'static, +// { +// fn new(self) -> Error { +// /* use std error's source() and backtrace() */ +// } +// } +// +// Since specialization is not stable yet, instead we rely on autoref behavior +// of method resolution to perform tagged dispatch. Here we have two traits +// AdhocKind and TraitKind that both have an anyhow_kind() method. AdhocKind is +// implemented whether or not the caller's type has a std error impl, while +// TraitKind is implemented only when a std error impl does exist. The ambiguity +// is resolved by AdhocKind requiring an extra autoref so that it has lower +// precedence. +// +// The anyhow! macro will set up the call in this form: +// +// #[allow(unused_imports)] +// use $crate::__private::{AdhocKind, TraitKind}; +// let error = $msg; +// (&error).anyhow_kind().new(error) + +use crate::Error; +use core::fmt::{Debug, Display}; + +#[cfg(feature = "std")] +use crate::StdError; + +pub struct Adhoc; + +pub trait AdhocKind: Sized { + #[inline] + fn anyhow_kind(&self) -> Adhoc { + Adhoc + } +} + +impl AdhocKind for &T where T: ?Sized + Display + Debug + Send + Sync + 'static {} + +impl Adhoc { + #[cold] + pub fn new(self, message: M) -> Error + where + M: Display + Debug + Send + Sync + 'static, + { + Error::from_adhoc(message, backtrace!()) + } +} + +pub struct Trait; + +pub trait TraitKind: Sized { + #[inline] + fn anyhow_kind(&self) -> Trait { + Trait + } +} + +impl TraitKind for E where E: Into {} + +impl Trait { + #[cold] + pub fn new(self, error: E) -> Error + where + E: Into, + { + error.into() + } +} + +#[cfg(feature = "std")] +pub struct Boxed; + +#[cfg(feature = "std")] +pub trait BoxedKind: Sized { + #[inline] + fn anyhow_kind(&self) -> Boxed { + Boxed + } +} + +#[cfg(feature = "std")] +impl BoxedKind for Box {} + +#[cfg(feature = "std")] +impl Boxed { + #[cold] + pub fn new(self, error: Box) -> Error { + let backtrace = backtrace_if_absent!(&*error); + Error::from_boxed(error, backtrace) + } +} diff --git a/third_party/rust/anyhow/src/lib.rs b/third_party/rust/anyhow/src/lib.rs new file mode 100644 index 0000000000..e570d6e9e3 --- /dev/null +++ b/third_party/rust/anyhow/src/lib.rs @@ -0,0 +1,680 @@ +//! [![github]](https://github.com/dtolnay/anyhow) [![crates-io]](https://crates.io/crates/anyhow) [![docs-rs]](https://docs.rs/anyhow) +//! +//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github +//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust +//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs +//! +//!
+//! +//! This library provides [`anyhow::Error`][Error], a trait object based error +//! type for easy idiomatic error handling in Rust applications. +//! +//!
+//! +//! # Details +//! +//! - Use `Result`, or equivalently `anyhow::Result`, as +//! the return type of any fallible function. +//! +//! Within the function, use `?` to easily propagate any error that implements +//! the `std::error::Error` trait. +//! +//! ``` +//! # pub trait Deserialize {} +//! # +//! # mod serde_json { +//! # use super::Deserialize; +//! # use std::io; +//! # +//! # pub fn from_str(json: &str) -> io::Result { +//! # unimplemented!() +//! # } +//! # } +//! # +//! # struct ClusterMap; +//! # +//! # impl Deserialize for ClusterMap {} +//! # +//! use anyhow::Result; +//! +//! fn get_cluster_info() -> Result { +//! let config = std::fs::read_to_string("cluster.json")?; +//! let map: ClusterMap = serde_json::from_str(&config)?; +//! Ok(map) +//! } +//! # +//! # fn main() {} +//! ``` +//! +//! - Attach context to help the person troubleshooting the error understand +//! where things went wrong. A low-level error like "No such file or +//! directory" can be annoying to debug without more context about what higher +//! level step the application was in the middle of. +//! +//! ``` +//! # struct It; +//! # +//! # impl It { +//! # fn detach(&self) -> Result<()> { +//! # unimplemented!() +//! # } +//! # } +//! # +//! use anyhow::{Context, Result}; +//! +//! fn main() -> Result<()> { +//! # return Ok(()); +//! # +//! # const _: &str = stringify! { +//! ... +//! # }; +//! # +//! # let it = It; +//! # let path = "./path/to/instrs.json"; +//! # +//! it.detach().context("Failed to detach the important thing")?; +//! +//! let content = std::fs::read(path) +//! .with_context(|| format!("Failed to read instrs from {}", path))?; +//! # +//! # const _: &str = stringify! { +//! ... +//! # }; +//! # +//! # Ok(()) +//! } +//! ``` +//! +//! ```console +//! Error: Failed to read instrs from ./path/to/instrs.json +//! +//! Caused by: +//! No such file or directory (os error 2) +//! ``` +//! +//! - Downcasting is supported and can be by value, by shared reference, or by +//! mutable reference as needed. +//! +//! ``` +//! # use anyhow::anyhow; +//! # use std::fmt::{self, Display}; +//! # use std::task::Poll; +//! # +//! # #[derive(Debug)] +//! # enum DataStoreError { +//! # Censored(()), +//! # } +//! # +//! # impl Display for DataStoreError { +//! # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { +//! # unimplemented!() +//! # } +//! # } +//! # +//! # impl std::error::Error for DataStoreError {} +//! # +//! # const REDACTED_CONTENT: () = (); +//! # +//! # let error = anyhow!("..."); +//! # let root_cause = &error; +//! # +//! # let ret = +//! // If the error was caused by redaction, then return a +//! // tombstone instead of the content. +//! match root_cause.downcast_ref::() { +//! Some(DataStoreError::Censored(_)) => Ok(Poll::Ready(REDACTED_CONTENT)), +//! None => Err(error), +//! } +//! # ; +//! ``` +//! +//! - If using the nightly channel, or stable with `features = ["backtrace"]`, a +//! backtrace is captured and printed with the error if the underlying error +//! type does not already provide its own. In order to see backtraces, they +//! must be enabled through the environment variables described in +//! [`std::backtrace`]: +//! +//! - If you want panics and errors to both have backtraces, set +//! `RUST_BACKTRACE=1`; +//! - If you want only errors to have backtraces, set `RUST_LIB_BACKTRACE=1`; +//! - If you want only panics to have backtraces, set `RUST_BACKTRACE=1` and +//! `RUST_LIB_BACKTRACE=0`. +//! +//! The tracking issue for this feature is [rust-lang/rust#53487]. +//! +//! [`std::backtrace`]: https://doc.rust-lang.org/std/backtrace/index.html#environment-variables +//! [rust-lang/rust#53487]: https://github.com/rust-lang/rust/issues/53487 +//! +//! - Anyhow works with any error type that has an impl of `std::error::Error`, +//! including ones defined in your crate. We do not bundle a `derive(Error)` +//! macro but you can write the impls yourself or use a standalone macro like +//! [thiserror]. +//! +//! [thiserror]: https://github.com/dtolnay/thiserror +//! +//! ``` +//! use thiserror::Error; +//! +//! #[derive(Error, Debug)] +//! pub enum FormatError { +//! #[error("Invalid header (expected {expected:?}, got {found:?})")] +//! InvalidHeader { +//! expected: String, +//! found: String, +//! }, +//! #[error("Missing attribute: {0}")] +//! MissingAttribute(String), +//! } +//! ``` +//! +//! - One-off error messages can be constructed using the `anyhow!` macro, which +//! supports string interpolation and produces an `anyhow::Error`. +//! +//! ``` +//! # use anyhow::{anyhow, Result}; +//! # +//! # fn demo() -> Result<()> { +//! # let missing = "..."; +//! return Err(anyhow!("Missing attribute: {}", missing)); +//! # Ok(()) +//! # } +//! ``` +//! +//! A `bail!` macro is provided as a shorthand for the same early return. +//! +//! ``` +//! # use anyhow::{bail, Result}; +//! # +//! # fn demo() -> Result<()> { +//! # let missing = "..."; +//! bail!("Missing attribute: {}", missing); +//! # Ok(()) +//! # } +//! ``` +//! +//!
+//! +//! # No-std support +//! +//! In no_std mode, the same API is almost all available and works the same way. +//! To depend on Anyhow in no_std mode, disable our default enabled "std" +//! feature in Cargo.toml. A global allocator is required. +//! +//! ```toml +//! [dependencies] +//! anyhow = { version = "1.0", default-features = false } +//! ``` +//! +//! Since the `?`-based error conversions would normally rely on the +//! `std::error::Error` trait which is only available through std, no_std mode +//! will require an explicit `.map_err(Error::msg)` when working with a +//! non-Anyhow error type inside a function that returns Anyhow's error type. + +#![doc(html_root_url = "https://docs.rs/anyhow/1.0.69")] +#![cfg_attr(backtrace, feature(error_generic_member_access, provide_any))] +#![cfg_attr(doc_cfg, feature(doc_cfg))] +#![cfg_attr(not(feature = "std"), no_std)] +#![deny(dead_code, unused_imports, unused_mut)] +#![allow( + clippy::doc_markdown, + clippy::enum_glob_use, + clippy::explicit_auto_deref, + clippy::missing_errors_doc, + clippy::missing_panics_doc, + clippy::module_name_repetitions, + clippy::must_use_candidate, + clippy::needless_doctest_main, + clippy::new_ret_no_self, + clippy::redundant_else, + clippy::return_self_not_must_use, + clippy::unused_self, + clippy::used_underscore_binding, + clippy::wildcard_imports, + clippy::wrong_self_convention +)] + +extern crate alloc; + +#[macro_use] +mod backtrace; +mod chain; +mod context; +mod ensure; +mod error; +mod fmt; +mod kind; +mod macros; +mod ptr; +mod wrapper; + +use crate::error::ErrorImpl; +use crate::ptr::Own; +use core::fmt::Display; + +#[cfg(not(feature = "std"))] +use core::fmt::Debug; + +#[cfg(feature = "std")] +use std::error::Error as StdError; + +#[cfg(not(feature = "std"))] +trait StdError: Debug + Display { + fn source(&self) -> Option<&(dyn StdError + 'static)> { + None + } +} + +pub use anyhow as format_err; + +/// The `Error` type, a wrapper around a dynamic error type. +/// +/// `Error` works a lot like `Box`, but with these +/// differences: +/// +/// - `Error` requires that the error is `Send`, `Sync`, and `'static`. +/// - `Error` guarantees that a backtrace is available, even if the underlying +/// error type does not provide one. +/// - `Error` is represented as a narrow pointer — exactly one word in +/// size instead of two. +/// +///
+/// +/// # Display representations +/// +/// When you print an error object using "{}" or to_string(), only the outermost +/// underlying error or context is printed, not any of the lower level causes. +/// This is exactly as if you had called the Display impl of the error from +/// which you constructed your anyhow::Error. +/// +/// ```console +/// Failed to read instrs from ./path/to/instrs.json +/// ``` +/// +/// To print causes as well using anyhow's default formatting of causes, use the +/// alternate selector "{:#}". +/// +/// ```console +/// Failed to read instrs from ./path/to/instrs.json: No such file or directory (os error 2) +/// ``` +/// +/// The Debug format "{:?}" includes your backtrace if one was captured. Note +/// that this is the representation you get by default if you return an error +/// from `fn main` instead of printing it explicitly yourself. +/// +/// ```console +/// Error: Failed to read instrs from ./path/to/instrs.json +/// +/// Caused by: +/// No such file or directory (os error 2) +/// ``` +/// +/// and if there is a backtrace available: +/// +/// ```console +/// Error: Failed to read instrs from ./path/to/instrs.json +/// +/// Caused by: +/// No such file or directory (os error 2) +/// +/// Stack backtrace: +/// 0: ::ext_context +/// at /git/anyhow/src/backtrace.rs:26 +/// 1: core::result::Result::map_err +/// at /git/rustc/src/libcore/result.rs:596 +/// 2: anyhow::context:: for core::result::Result>::with_context +/// at /git/anyhow/src/context.rs:58 +/// 3: testing::main +/// at src/main.rs:5 +/// 4: std::rt::lang_start +/// at /git/rustc/src/libstd/rt.rs:61 +/// 5: main +/// 6: __libc_start_main +/// 7: _start +/// ``` +/// +/// To see a conventional struct-style Debug representation, use "{:#?}". +/// +/// ```console +/// Error { +/// context: "Failed to read instrs from ./path/to/instrs.json", +/// source: Os { +/// code: 2, +/// kind: NotFound, +/// message: "No such file or directory", +/// }, +/// } +/// ``` +/// +/// If none of the built-in representations are appropriate and you would prefer +/// to render the error and its cause chain yourself, it can be done something +/// like this: +/// +/// ``` +/// use anyhow::{Context, Result}; +/// +/// fn main() { +/// if let Err(err) = try_main() { +/// eprintln!("ERROR: {}", err); +/// err.chain().skip(1).for_each(|cause| eprintln!("because: {}", cause)); +/// std::process::exit(1); +/// } +/// } +/// +/// fn try_main() -> Result<()> { +/// # const IGNORE: &str = stringify! { +/// ... +/// # }; +/// # Ok(()) +/// } +/// ``` +#[cfg_attr(not(doc), repr(transparent))] +pub struct Error { + inner: Own, +} + +/// Iterator of a chain of source errors. +/// +/// This type is the iterator returned by [`Error::chain`]. +/// +/// # Example +/// +/// ``` +/// use anyhow::Error; +/// use std::io; +/// +/// pub fn underlying_io_error_kind(error: &Error) -> Option { +/// for cause in error.chain() { +/// if let Some(io_error) = cause.downcast_ref::() { +/// return Some(io_error.kind()); +/// } +/// } +/// None +/// } +/// ``` +#[cfg(feature = "std")] +#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] +#[derive(Clone)] +pub struct Chain<'a> { + state: crate::chain::ChainState<'a>, +} + +/// `Result` +/// +/// This is a reasonable return type to use throughout your application but also +/// for `fn main`; if you do, failures will be printed along with any +/// [context][Context] and a backtrace if one was captured. +/// +/// `anyhow::Result` may be used with one *or* two type parameters. +/// +/// ```rust +/// use anyhow::Result; +/// +/// # const IGNORE: &str = stringify! { +/// fn demo1() -> Result {...} +/// // ^ equivalent to std::result::Result +/// +/// fn demo2() -> Result {...} +/// // ^ equivalent to std::result::Result +/// # }; +/// ``` +/// +/// # Example +/// +/// ``` +/// # pub trait Deserialize {} +/// # +/// # mod serde_json { +/// # use super::Deserialize; +/// # use std::io; +/// # +/// # pub fn from_str(json: &str) -> io::Result { +/// # unimplemented!() +/// # } +/// # } +/// # +/// # #[derive(Debug)] +/// # struct ClusterMap; +/// # +/// # impl Deserialize for ClusterMap {} +/// # +/// use anyhow::Result; +/// +/// fn main() -> Result<()> { +/// # return Ok(()); +/// let config = std::fs::read_to_string("cluster.json")?; +/// let map: ClusterMap = serde_json::from_str(&config)?; +/// println!("cluster info: {:#?}", map); +/// Ok(()) +/// } +/// ``` +pub type Result = core::result::Result; + +/// Provides the `context` method for `Result`. +/// +/// This trait is sealed and cannot be implemented for types outside of +/// `anyhow`. +/// +///
+/// +/// # Example +/// +/// ``` +/// use anyhow::{Context, Result}; +/// use std::fs; +/// use std::path::PathBuf; +/// +/// pub struct ImportantThing { +/// path: PathBuf, +/// } +/// +/// impl ImportantThing { +/// # const IGNORE: &'static str = stringify! { +/// pub fn detach(&mut self) -> Result<()> {...} +/// # }; +/// # fn detach(&mut self) -> Result<()> { +/// # unimplemented!() +/// # } +/// } +/// +/// pub fn do_it(mut it: ImportantThing) -> Result> { +/// it.detach().context("Failed to detach the important thing")?; +/// +/// let path = &it.path; +/// let content = fs::read(path) +/// .with_context(|| format!("Failed to read instrs from {}", path.display()))?; +/// +/// Ok(content) +/// } +/// ``` +/// +/// When printed, the outermost context would be printed first and the lower +/// level underlying causes would be enumerated below. +/// +/// ```console +/// Error: Failed to read instrs from ./path/to/instrs.json +/// +/// Caused by: +/// No such file or directory (os error 2) +/// ``` +/// +/// Refer to the [Display representations] documentation for other forms in +/// which this context chain can be rendered. +/// +/// [Display representations]: Error#display-representations +/// +///
+/// +/// # Effect on downcasting +/// +/// After attaching context of type `C` onto an error of type `E`, the resulting +/// `anyhow::Error` may be downcast to `C` **or** to `E`. +/// +/// That is, in codebases that rely on downcasting, Anyhow's context supports +/// both of the following use cases: +/// +/// - **Attaching context whose type is insignificant onto errors whose type +/// is used in downcasts.** +/// +/// In other error libraries whose context is not designed this way, it can +/// be risky to introduce context to existing code because new context might +/// break existing working downcasts. In Anyhow, any downcast that worked +/// before adding context will continue to work after you add a context, so +/// you should freely add human-readable context to errors wherever it would +/// be helpful. +/// +/// ``` +/// # use anyhow::bail; +/// # use thiserror::Error; +/// # +/// # #[derive(Error, Debug)] +/// # #[error("???")] +/// # struct SuspiciousError; +/// # +/// # fn helper() -> Result<()> { +/// # bail!(SuspiciousError); +/// # } +/// # +/// use anyhow::{Context, Result}; +/// +/// fn do_it() -> Result<()> { +/// helper().context("Failed to complete the work")?; +/// # const IGNORE: &str = stringify! { +/// ... +/// # }; +/// # unreachable!() +/// } +/// +/// fn main() { +/// let err = do_it().unwrap_err(); +/// if let Some(e) = err.downcast_ref::() { +/// // If helper() returned SuspiciousError, this downcast will +/// // correctly succeed even with the context in between. +/// # return; +/// } +/// # panic!("expected downcast to succeed"); +/// } +/// ``` +/// +/// - **Attaching context whose type is used in downcasts onto errors whose +/// type is insignificant.** +/// +/// Some codebases prefer to use machine-readable context to categorize +/// lower level errors in a way that will be actionable to higher levels of +/// the application. +/// +/// ``` +/// # use anyhow::bail; +/// # use thiserror::Error; +/// # +/// # #[derive(Error, Debug)] +/// # #[error("???")] +/// # struct HelperFailed; +/// # +/// # fn helper() -> Result<()> { +/// # bail!("no such file or directory"); +/// # } +/// # +/// use anyhow::{Context, Result}; +/// +/// fn do_it() -> Result<()> { +/// helper().context(HelperFailed)?; +/// # const IGNORE: &str = stringify! { +/// ... +/// # }; +/// # unreachable!() +/// } +/// +/// fn main() { +/// let err = do_it().unwrap_err(); +/// if let Some(e) = err.downcast_ref::() { +/// // If helper failed, this downcast will succeed because +/// // HelperFailed is the context that has been attached to +/// // that error. +/// # return; +/// } +/// # panic!("expected downcast to succeed"); +/// } +/// ``` +pub trait Context: context::private::Sealed { + /// Wrap the error value with additional context. + fn context(self, context: C) -> Result + where + C: Display + Send + Sync + 'static; + + /// Wrap the error value with additional context that is evaluated lazily + /// only once an error does occur. + fn with_context(self, f: F) -> Result + where + C: Display + Send + Sync + 'static, + F: FnOnce() -> C; +} + +/// Equivalent to Ok::<_, anyhow::Error>(value). +/// +/// This simplifies creation of an anyhow::Result in places where type inference +/// cannot deduce the `E` type of the result — without needing to write +/// `Ok::<_, anyhow::Error>(value)`. +/// +/// One might think that `anyhow::Result::Ok(value)` would work in such cases +/// but it does not. +/// +/// ```console +/// error[E0282]: type annotations needed for `std::result::Result` +/// --> src/main.rs:11:13 +/// | +/// 11 | let _ = anyhow::Result::Ok(1); +/// | - ^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `E` declared on the enum `Result` +/// | | +/// | consider giving this pattern the explicit type `std::result::Result`, where the type parameter `E` is specified +/// ``` +#[allow(non_snake_case)] +pub fn Ok(t: T) -> Result { + Result::Ok(t) +} + +// Not public API. Referenced by macro-generated code. +#[doc(hidden)] +pub mod __private { + use crate::Error; + use alloc::fmt; + use core::fmt::Arguments; + + pub use crate::ensure::{BothDebug, NotBothDebug}; + pub use alloc::format; + pub use core::result::Result::Err; + pub use core::{concat, format_args, stringify}; + + #[doc(hidden)] + pub mod kind { + pub use crate::kind::{AdhocKind, TraitKind}; + + #[cfg(feature = "std")] + pub use crate::kind::BoxedKind; + } + + #[doc(hidden)] + #[inline] + #[cold] + pub fn format_err(args: Arguments) -> Error { + #[cfg(anyhow_no_fmt_arguments_as_str)] + let fmt_arguments_as_str = None::<&str>; + #[cfg(not(anyhow_no_fmt_arguments_as_str))] + let fmt_arguments_as_str = args.as_str(); + + if let Some(message) = fmt_arguments_as_str { + // anyhow!("literal"), can downcast to &'static str + Error::msg(message) + } else { + // anyhow!("interpolate {var}"), can downcast to String + Error::msg(fmt::format(args)) + } + } + + #[doc(hidden)] + #[inline] + #[cold] + #[must_use] + pub fn must_use(error: Error) -> Error { + error + } +} diff --git a/third_party/rust/anyhow/src/macros.rs b/third_party/rust/anyhow/src/macros.rs new file mode 100644 index 0000000000..6dd22743b7 --- /dev/null +++ b/third_party/rust/anyhow/src/macros.rs @@ -0,0 +1,231 @@ +/// Return early with an error. +/// +/// This macro is equivalent to `return Err(`[`anyhow!($args...)`][anyhow!]`)`. +/// +/// The surrounding function's or closure's return value is required to be +/// `Result<_,`[`anyhow::Error`][crate::Error]`>`. +/// +/// [anyhow!]: crate::anyhow +/// +/// # Example +/// +/// ``` +/// # use anyhow::{bail, Result}; +/// # +/// # fn has_permission(user: usize, resource: usize) -> bool { +/// # true +/// # } +/// # +/// # fn main() -> Result<()> { +/// # let user = 0; +/// # let resource = 0; +/// # +/// if !has_permission(user, resource) { +/// bail!("permission denied for accessing {}", resource); +/// } +/// # Ok(()) +/// # } +/// ``` +/// +/// ``` +/// # use anyhow::{bail, Result}; +/// # use thiserror::Error; +/// # +/// # const MAX_DEPTH: usize = 1; +/// # +/// #[derive(Error, Debug)] +/// enum ScienceError { +/// #[error("recursion limit exceeded")] +/// RecursionLimitExceeded, +/// # #[error("...")] +/// # More = (stringify! { +/// ... +/// # }, 1).1, +/// } +/// +/// # fn main() -> Result<()> { +/// # let depth = 0; +/// # +/// if depth > MAX_DEPTH { +/// bail!(ScienceError::RecursionLimitExceeded); +/// } +/// # Ok(()) +/// # } +/// ``` +#[macro_export] +macro_rules! bail { + ($msg:literal $(,)?) => { + return $crate::__private::Err($crate::__anyhow!($msg)) + }; + ($err:expr $(,)?) => { + return $crate::__private::Err($crate::__anyhow!($err)) + }; + ($fmt:expr, $($arg:tt)*) => { + return $crate::__private::Err($crate::__anyhow!($fmt, $($arg)*)) + }; +} + +/// Return early with an error if a condition is not satisfied. +/// +/// This macro is equivalent to `if !$cond { return +/// Err(`[`anyhow!($args...)`][anyhow!]`); }`. +/// +/// The surrounding function's or closure's return value is required to be +/// `Result<_,`[`anyhow::Error`][crate::Error]`>`. +/// +/// Analogously to `assert!`, `ensure!` takes a condition and exits the function +/// if the condition fails. Unlike `assert!`, `ensure!` returns an `Error` +/// rather than panicking. +/// +/// [anyhow!]: crate::anyhow +/// +/// # Example +/// +/// ``` +/// # use anyhow::{ensure, Result}; +/// # +/// # fn main() -> Result<()> { +/// # let user = 0; +/// # +/// ensure!(user == 0, "only user 0 is allowed"); +/// # Ok(()) +/// # } +/// ``` +/// +/// ``` +/// # use anyhow::{ensure, Result}; +/// # use thiserror::Error; +/// # +/// # const MAX_DEPTH: usize = 1; +/// # +/// #[derive(Error, Debug)] +/// enum ScienceError { +/// #[error("recursion limit exceeded")] +/// RecursionLimitExceeded, +/// # #[error("...")] +/// # More = (stringify! { +/// ... +/// # }, 1).1, +/// } +/// +/// # fn main() -> Result<()> { +/// # let depth = 0; +/// # +/// ensure!(depth <= MAX_DEPTH, ScienceError::RecursionLimitExceeded); +/// # Ok(()) +/// # } +/// ``` +#[cfg(doc)] +#[macro_export] +macro_rules! ensure { + ($cond:expr $(,)?) => { + if !$cond { + return $crate::__private::Err($crate::Error::msg( + $crate::__private::concat!("Condition failed: `", $crate::__private::stringify!($cond), "`") + )); + } + }; + ($cond:expr, $msg:literal $(,)?) => { + if !$cond { + return $crate::__private::Err($crate::__anyhow!($msg)); + } + }; + ($cond:expr, $err:expr $(,)?) => { + if !$cond { + return $crate::__private::Err($crate::__anyhow!($err)); + } + }; + ($cond:expr, $fmt:expr, $($arg:tt)*) => { + if !$cond { + return $crate::__private::Err($crate::__anyhow!($fmt, $($arg)*)); + } + }; +} + +#[cfg(not(doc))] +#[macro_export] +macro_rules! ensure { + ($($tt:tt)*) => { + $crate::__parse_ensure!( + /* state */ 0 + /* stack */ () + /* bail */ ($($tt)*) + /* fuel */ (~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~) + /* parse */ {()} + /* dup */ ($($tt)*) + /* rest */ $($tt)* + ) + }; +} + +/// Construct an ad-hoc error from a string or existing non-`anyhow` error +/// value. +/// +/// This evaluates to an [`Error`][crate::Error]. It can take either just a +/// string, or a format string with arguments. It also can take any custom type +/// which implements `Debug` and `Display`. +/// +/// If called with a single argument whose type implements `std::error::Error` +/// (in addition to `Debug` and `Display`, which are always required), then that +/// Error impl's `source` is preserved as the `source` of the resulting +/// `anyhow::Error`. +/// +/// # Example +/// +/// ``` +/// # type V = (); +/// # +/// use anyhow::{anyhow, Result}; +/// +/// fn lookup(key: &str) -> Result { +/// if key.len() != 16 { +/// return Err(anyhow!("key length must be 16 characters, got {:?}", key)); +/// } +/// +/// // ... +/// # Ok(()) +/// } +/// ``` +#[macro_export] +macro_rules! anyhow { + ($msg:literal $(,)?) => { + $crate::__private::must_use({ + let error = $crate::__private::format_err($crate::__private::format_args!($msg)); + error + }) + }; + ($err:expr $(,)?) => { + $crate::__private::must_use({ + use $crate::__private::kind::*; + let error = match $err { + error => (&error).anyhow_kind().new(error), + }; + error + }) + }; + ($fmt:expr, $($arg:tt)*) => { + $crate::Error::msg($crate::__private::format!($fmt, $($arg)*)) + }; +} + +// Not public API. This is used in the implementation of some of the other +// macros, in which the must_use call is not needed because the value is known +// to be used. +#[doc(hidden)] +#[macro_export] +macro_rules! __anyhow { + ($msg:literal $(,)?) => ({ + let error = $crate::__private::format_err($crate::__private::format_args!($msg)); + error + }); + ($err:expr $(,)?) => ({ + use $crate::__private::kind::*; + let error = match $err { + error => (&error).anyhow_kind().new(error), + }; + error + }); + ($fmt:expr, $($arg:tt)*) => { + $crate::Error::msg($crate::__private::format!($fmt, $($arg)*)) + }; +} diff --git a/third_party/rust/anyhow/src/ptr.rs b/third_party/rust/anyhow/src/ptr.rs new file mode 100644 index 0000000000..c7fe488b6f --- /dev/null +++ b/third_party/rust/anyhow/src/ptr.rs @@ -0,0 +1,199 @@ +use alloc::boxed::Box; +use core::marker::PhantomData; +use core::ptr::NonNull; + +#[repr(transparent)] +pub struct Own +where + T: ?Sized, +{ + pub ptr: NonNull, +} + +unsafe impl Send for Own where T: ?Sized {} + +unsafe impl Sync for Own where T: ?Sized {} + +impl Copy for Own where T: ?Sized {} + +impl Clone for Own +where + T: ?Sized, +{ + fn clone(&self) -> Self { + *self + } +} + +impl Own +where + T: ?Sized, +{ + pub fn new(ptr: Box) -> Self { + Own { + ptr: unsafe { NonNull::new_unchecked(Box::into_raw(ptr)) }, + } + } + + pub fn cast(self) -> Own { + Own { + ptr: self.ptr.cast(), + } + } + + pub unsafe fn boxed(self) -> Box { + Box::from_raw(self.ptr.as_ptr()) + } + + pub fn by_ref(&self) -> Ref { + Ref { + ptr: self.ptr, + lifetime: PhantomData, + } + } + + pub fn by_mut(&mut self) -> Mut { + Mut { + ptr: self.ptr, + lifetime: PhantomData, + } + } +} + +#[repr(transparent)] +pub struct Ref<'a, T> +where + T: ?Sized, +{ + pub ptr: NonNull, + lifetime: PhantomData<&'a T>, +} + +impl<'a, T> Copy for Ref<'a, T> where T: ?Sized {} + +impl<'a, T> Clone for Ref<'a, T> +where + T: ?Sized, +{ + fn clone(&self) -> Self { + *self + } +} + +impl<'a, T> Ref<'a, T> +where + T: ?Sized, +{ + pub fn new(ptr: &'a T) -> Self { + Ref { + ptr: NonNull::from(ptr), + lifetime: PhantomData, + } + } + + #[cfg(not(anyhow_no_ptr_addr_of))] + pub fn from_raw(ptr: NonNull) -> Self { + Ref { + ptr, + lifetime: PhantomData, + } + } + + pub fn cast(self) -> Ref<'a, U::Target> { + Ref { + ptr: self.ptr.cast(), + lifetime: PhantomData, + } + } + + #[cfg(not(anyhow_no_ptr_addr_of))] + pub fn by_mut(self) -> Mut<'a, T> { + Mut { + ptr: self.ptr, + lifetime: PhantomData, + } + } + + #[cfg(not(anyhow_no_ptr_addr_of))] + pub fn as_ptr(self) -> *const T { + self.ptr.as_ptr() as *const T + } + + pub unsafe fn deref(self) -> &'a T { + &*self.ptr.as_ptr() + } +} + +#[repr(transparent)] +pub struct Mut<'a, T> +where + T: ?Sized, +{ + pub ptr: NonNull, + lifetime: PhantomData<&'a mut T>, +} + +impl<'a, T> Copy for Mut<'a, T> where T: ?Sized {} + +impl<'a, T> Clone for Mut<'a, T> +where + T: ?Sized, +{ + fn clone(&self) -> Self { + *self + } +} + +impl<'a, T> Mut<'a, T> +where + T: ?Sized, +{ + #[cfg(anyhow_no_ptr_addr_of)] + pub fn new(ptr: &'a mut T) -> Self { + Mut { + ptr: NonNull::from(ptr), + lifetime: PhantomData, + } + } + + pub fn cast(self) -> Mut<'a, U::Target> { + Mut { + ptr: self.ptr.cast(), + lifetime: PhantomData, + } + } + + #[cfg(not(anyhow_no_ptr_addr_of))] + pub fn by_ref(self) -> Ref<'a, T> { + Ref { + ptr: self.ptr, + lifetime: PhantomData, + } + } + + pub fn extend<'b>(self) -> Mut<'b, T> { + Mut { + ptr: self.ptr, + lifetime: PhantomData, + } + } + + pub unsafe fn deref_mut(self) -> &'a mut T { + &mut *self.ptr.as_ptr() + } +} + +impl<'a, T> Mut<'a, T> { + pub unsafe fn read(self) -> T { + self.ptr.as_ptr().read() + } +} + +// Force turbofish on all calls of `.cast::()`. +pub trait CastTo { + type Target; +} + +impl CastTo for T { + type Target = T; +} diff --git a/third_party/rust/anyhow/src/wrapper.rs b/third_party/rust/anyhow/src/wrapper.rs new file mode 100644 index 0000000000..5f18a50313 --- /dev/null +++ b/third_party/rust/anyhow/src/wrapper.rs @@ -0,0 +1,81 @@ +use crate::StdError; +use core::fmt::{self, Debug, Display}; + +#[cfg(backtrace)] +use std::any::Demand; + +#[repr(transparent)] +pub struct MessageError(pub M); + +impl Debug for MessageError +where + M: Display + Debug, +{ + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + Debug::fmt(&self.0, f) + } +} + +impl Display for MessageError +where + M: Display + Debug, +{ + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + Display::fmt(&self.0, f) + } +} + +impl StdError for MessageError where M: Display + Debug + 'static {} + +#[repr(transparent)] +pub struct DisplayError(pub M); + +impl Debug for DisplayError +where + M: Display, +{ + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + Display::fmt(&self.0, f) + } +} + +impl Display for DisplayError +where + M: Display, +{ + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + Display::fmt(&self.0, f) + } +} + +impl StdError for DisplayError where M: Display + 'static {} + +#[cfg(feature = "std")] +#[repr(transparent)] +pub struct BoxedError(pub Box); + +#[cfg(feature = "std")] +impl Debug for BoxedError { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + Debug::fmt(&self.0, f) + } +} + +#[cfg(feature = "std")] +impl Display for BoxedError { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + Display::fmt(&self.0, f) + } +} + +#[cfg(feature = "std")] +impl StdError for BoxedError { + fn source(&self) -> Option<&(dyn StdError + 'static)> { + self.0.source() + } + + #[cfg(backtrace)] + fn provide<'a>(&'a self, demand: &mut Demand<'a>) { + self.0.provide(demand); + } +} diff --git a/third_party/rust/anyhow/tests/common/mod.rs b/third_party/rust/anyhow/tests/common/mod.rs new file mode 100644 index 0000000000..fc165a5be9 --- /dev/null +++ b/third_party/rust/anyhow/tests/common/mod.rs @@ -0,0 +1,14 @@ +use anyhow::{bail, Result}; +use std::io; + +pub fn bail_literal() -> Result<()> { + bail!("oh no!"); +} + +pub fn bail_fmt() -> Result<()> { + bail!("{} {}!", "oh", "no"); +} + +pub fn bail_error() -> Result<()> { + bail!(io::Error::new(io::ErrorKind::Other, "oh no!")); +} diff --git a/third_party/rust/anyhow/tests/compiletest.rs b/third_party/rust/anyhow/tests/compiletest.rs new file mode 100644 index 0000000000..7974a6249e --- /dev/null +++ b/third_party/rust/anyhow/tests/compiletest.rs @@ -0,0 +1,7 @@ +#[rustversion::attr(not(nightly), ignore)] +#[cfg_attr(miri, ignore)] +#[test] +fn ui() { + let t = trybuild::TestCases::new(); + t.compile_fail("tests/ui/*.rs"); +} diff --git a/third_party/rust/anyhow/tests/drop/mod.rs b/third_party/rust/anyhow/tests/drop/mod.rs new file mode 100644 index 0000000000..7da4bf55a1 --- /dev/null +++ b/third_party/rust/anyhow/tests/drop/mod.rs @@ -0,0 +1,53 @@ +#![allow(clippy::module_name_repetitions)] + +use std::error::Error as StdError; +use std::fmt::{self, Display}; +use std::sync::atomic::{AtomicBool, Ordering}; +use std::sync::Arc; + +#[derive(Debug)] +pub struct Flag { + atomic: Arc, +} + +impl Flag { + pub fn new() -> Self { + Flag { + atomic: Arc::new(AtomicBool::new(false)), + } + } + + pub fn get(&self) -> bool { + self.atomic.load(Ordering::Relaxed) + } +} + +#[derive(Debug)] +pub struct DetectDrop { + has_dropped: Flag, +} + +impl DetectDrop { + pub fn new(has_dropped: &Flag) -> Self { + DetectDrop { + has_dropped: Flag { + atomic: Arc::clone(&has_dropped.atomic), + }, + } + } +} + +impl StdError for DetectDrop {} + +impl Display for DetectDrop { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + write!(f, "oh no!") + } +} + +impl Drop for DetectDrop { + fn drop(&mut self) { + let already_dropped = self.has_dropped.atomic.swap(true, Ordering::Relaxed); + assert!(!already_dropped); + } +} diff --git a/third_party/rust/anyhow/tests/test_autotrait.rs b/third_party/rust/anyhow/tests/test_autotrait.rs new file mode 100644 index 0000000000..0c9326dad6 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_autotrait.rs @@ -0,0 +1,13 @@ +use anyhow::Error; + +#[test] +fn test_send() { + fn assert_send() {} + assert_send::(); +} + +#[test] +fn test_sync() { + fn assert_sync() {} + assert_sync::(); +} diff --git a/third_party/rust/anyhow/tests/test_backtrace.rs b/third_party/rust/anyhow/tests/test_backtrace.rs new file mode 100644 index 0000000000..ce385f5011 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_backtrace.rs @@ -0,0 +1,13 @@ +#[rustversion::not(nightly)] +#[ignore] +#[test] +fn test_backtrace() {} + +#[rustversion::nightly] +#[test] +fn test_backtrace() { + use anyhow::anyhow; + + let error = anyhow!("oh no!"); + let _ = error.backtrace(); +} diff --git a/third_party/rust/anyhow/tests/test_boxed.rs b/third_party/rust/anyhow/tests/test_boxed.rs new file mode 100644 index 0000000000..fb1fb132d5 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_boxed.rs @@ -0,0 +1,45 @@ +#![allow( + // Clippy bug: https://github.com/rust-lang/rust-clippy/issues/7422 + clippy::nonstandard_macro_braces, +)] + +use anyhow::anyhow; +use std::error::Error as StdError; +use std::io; +use thiserror::Error; + +#[derive(Error, Debug)] +#[error("outer")] +struct MyError { + source: io::Error, +} + +#[test] +fn test_boxed_str() { + let error = Box::::from("oh no!"); + let error = anyhow!(error); + assert_eq!("oh no!", error.to_string()); + assert_eq!( + "oh no!", + error + .downcast_ref::>() + .unwrap() + .to_string() + ); +} + +#[test] +fn test_boxed_thiserror() { + let error = MyError { + source: io::Error::new(io::ErrorKind::Other, "oh no!"), + }; + let error = anyhow!(error); + assert_eq!("oh no!", error.source().unwrap().to_string()); +} + +#[test] +fn test_boxed_anyhow() { + let error = anyhow!("oh no!").context("it failed"); + let error = anyhow!(error); + assert_eq!("oh no!", error.source().unwrap().to_string()); +} diff --git a/third_party/rust/anyhow/tests/test_chain.rs b/third_party/rust/anyhow/tests/test_chain.rs new file mode 100644 index 0000000000..c8b901ab41 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_chain.rs @@ -0,0 +1,69 @@ +use anyhow::{anyhow, Chain, Error}; + +fn error() -> Error { + anyhow!({ 0 }).context(1).context(2).context(3) +} + +#[test] +fn test_iter() { + let e = error(); + let mut chain = e.chain(); + assert_eq!("3", chain.next().unwrap().to_string()); + assert_eq!("2", chain.next().unwrap().to_string()); + assert_eq!("1", chain.next().unwrap().to_string()); + assert_eq!("0", chain.next().unwrap().to_string()); + assert!(chain.next().is_none()); + assert!(chain.next_back().is_none()); +} + +#[test] +fn test_rev() { + let e = error(); + let mut chain = e.chain().rev(); + assert_eq!("0", chain.next().unwrap().to_string()); + assert_eq!("1", chain.next().unwrap().to_string()); + assert_eq!("2", chain.next().unwrap().to_string()); + assert_eq!("3", chain.next().unwrap().to_string()); + assert!(chain.next().is_none()); + assert!(chain.next_back().is_none()); +} + +#[test] +fn test_len() { + let e = error(); + let mut chain = e.chain(); + assert_eq!(4, chain.len()); + assert_eq!((4, Some(4)), chain.size_hint()); + assert_eq!("3", chain.next().unwrap().to_string()); + assert_eq!(3, chain.len()); + assert_eq!((3, Some(3)), chain.size_hint()); + assert_eq!("0", chain.next_back().unwrap().to_string()); + assert_eq!(2, chain.len()); + assert_eq!((2, Some(2)), chain.size_hint()); + assert_eq!("2", chain.next().unwrap().to_string()); + assert_eq!(1, chain.len()); + assert_eq!((1, Some(1)), chain.size_hint()); + assert_eq!("1", chain.next_back().unwrap().to_string()); + assert_eq!(0, chain.len()); + assert_eq!((0, Some(0)), chain.size_hint()); + assert!(chain.next().is_none()); +} + +#[test] +fn test_default() { + let mut c = Chain::default(); + assert!(c.next().is_none()); +} + +#[test] +#[allow(clippy::redundant_clone)] +fn test_clone() { + let e = error(); + let mut chain = e.chain().clone(); + assert_eq!("3", chain.next().unwrap().to_string()); + assert_eq!("2", chain.next().unwrap().to_string()); + assert_eq!("1", chain.next().unwrap().to_string()); + assert_eq!("0", chain.next().unwrap().to_string()); + assert!(chain.next().is_none()); + assert!(chain.next_back().is_none()); +} diff --git a/third_party/rust/anyhow/tests/test_context.rs b/third_party/rust/anyhow/tests/test_context.rs new file mode 100644 index 0000000000..2053fc9e57 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_context.rs @@ -0,0 +1,172 @@ +#![allow( + // Clippy bug: https://github.com/rust-lang/rust-clippy/issues/7422 + clippy::nonstandard_macro_braces, +)] + +mod drop; + +use crate::drop::{DetectDrop, Flag}; +use anyhow::{Context, Error, Result}; +use std::fmt::{self, Display}; +use thiserror::Error; + +// https://github.com/dtolnay/anyhow/issues/18 +#[test] +fn test_inference() -> Result<()> { + let x = "1"; + let y: u32 = x.parse().context("...")?; + assert_eq!(y, 1); + Ok(()) +} + +macro_rules! context_type { + ($name:ident) => { + #[derive(Debug)] + struct $name { + message: &'static str, + #[allow(dead_code)] + drop: DetectDrop, + } + + impl Display for $name { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.write_str(self.message) + } + } + }; +} + +context_type!(HighLevel); +context_type!(MidLevel); + +#[derive(Error, Debug)] +#[error("{message}")] +struct LowLevel { + message: &'static str, + drop: DetectDrop, +} + +struct Dropped { + low: Flag, + mid: Flag, + high: Flag, +} + +impl Dropped { + fn none(&self) -> bool { + !self.low.get() && !self.mid.get() && !self.high.get() + } + + fn all(&self) -> bool { + self.low.get() && self.mid.get() && self.high.get() + } +} + +fn make_chain() -> (Error, Dropped) { + let dropped = Dropped { + low: Flag::new(), + mid: Flag::new(), + high: Flag::new(), + }; + + let low = LowLevel { + message: "no such file or directory", + drop: DetectDrop::new(&dropped.low), + }; + + // impl Context for Result + let mid = Err::<(), LowLevel>(low) + .context(MidLevel { + message: "failed to load config", + drop: DetectDrop::new(&dropped.mid), + }) + .unwrap_err(); + + // impl Context for Result + let high = Err::<(), Error>(mid) + .context(HighLevel { + message: "failed to start server", + drop: DetectDrop::new(&dropped.high), + }) + .unwrap_err(); + + (high, dropped) +} + +#[test] +fn test_downcast_ref() { + let (err, dropped) = make_chain(); + + assert!(!err.is::()); + assert!(err.downcast_ref::().is_none()); + + assert!(err.is::()); + let high = err.downcast_ref::().unwrap(); + assert_eq!(high.to_string(), "failed to start server"); + + assert!(err.is::()); + let mid = err.downcast_ref::().unwrap(); + assert_eq!(mid.to_string(), "failed to load config"); + + assert!(err.is::()); + let low = err.downcast_ref::().unwrap(); + assert_eq!(low.to_string(), "no such file or directory"); + + assert!(dropped.none()); + drop(err); + assert!(dropped.all()); +} + +#[test] +fn test_downcast_high() { + let (err, dropped) = make_chain(); + + let err = err.downcast::().unwrap(); + assert!(!dropped.high.get()); + assert!(dropped.low.get() && dropped.mid.get()); + + drop(err); + assert!(dropped.all()); +} + +#[test] +fn test_downcast_mid() { + let (err, dropped) = make_chain(); + + let err = err.downcast::().unwrap(); + assert!(!dropped.mid.get()); + assert!(dropped.low.get() && dropped.high.get()); + + drop(err); + assert!(dropped.all()); +} + +#[test] +fn test_downcast_low() { + let (err, dropped) = make_chain(); + + let err = err.downcast::().unwrap(); + assert!(!dropped.low.get()); + assert!(dropped.mid.get() && dropped.high.get()); + + drop(err); + assert!(dropped.all()); +} + +#[test] +fn test_unsuccessful_downcast() { + let (err, dropped) = make_chain(); + + let err = err.downcast::().unwrap_err(); + assert!(dropped.none()); + + drop(err); + assert!(dropped.all()); +} + +#[test] +fn test_root_cause() { + let (err, _) = make_chain(); + + assert_eq!(err.root_cause().to_string(), "no such file or directory"); +} diff --git a/third_party/rust/anyhow/tests/test_convert.rs b/third_party/rust/anyhow/tests/test_convert.rs new file mode 100644 index 0000000000..6da171d1b8 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_convert.rs @@ -0,0 +1,46 @@ +#![allow(clippy::unnecessary_wraps)] + +mod drop; + +use self::drop::{DetectDrop, Flag}; +use anyhow::{Error, Result}; +use std::error::Error as StdError; + +#[test] +fn test_convert() { + let has_dropped = Flag::new(); + let error = Error::new(DetectDrop::new(&has_dropped)); + let box_dyn = Box::::from(error); + assert_eq!("oh no!", box_dyn.to_string()); + drop(box_dyn); + assert!(has_dropped.get()); +} + +#[test] +fn test_convert_send() { + let has_dropped = Flag::new(); + let error = Error::new(DetectDrop::new(&has_dropped)); + let box_dyn = Box::::from(error); + assert_eq!("oh no!", box_dyn.to_string()); + drop(box_dyn); + assert!(has_dropped.get()); +} + +#[test] +fn test_convert_send_sync() { + let has_dropped = Flag::new(); + let error = Error::new(DetectDrop::new(&has_dropped)); + let box_dyn = Box::::from(error); + assert_eq!("oh no!", box_dyn.to_string()); + drop(box_dyn); + assert!(has_dropped.get()); +} + +#[test] +fn test_question_mark() -> Result<(), Box> { + fn f() -> Result<()> { + Ok(()) + } + f()?; + Ok(()) +} diff --git a/third_party/rust/anyhow/tests/test_downcast.rs b/third_party/rust/anyhow/tests/test_downcast.rs new file mode 100644 index 0000000000..b4470d551a --- /dev/null +++ b/third_party/rust/anyhow/tests/test_downcast.rs @@ -0,0 +1,123 @@ +#![allow(clippy::assertions_on_result_states, clippy::wildcard_imports)] + +mod common; +mod drop; + +use self::common::*; +use self::drop::{DetectDrop, Flag}; +use anyhow::Error; +use std::error::Error as StdError; +use std::fmt::{self, Display}; +use std::io; + +#[test] +fn test_downcast() { + assert_eq!( + "oh no!", + bail_literal().unwrap_err().downcast::<&str>().unwrap(), + ); + assert_eq!( + "oh no!", + bail_fmt().unwrap_err().downcast::().unwrap(), + ); + assert_eq!( + "oh no!", + bail_error() + .unwrap_err() + .downcast::() + .unwrap() + .to_string(), + ); +} + +#[test] +fn test_downcast_ref() { + assert_eq!( + "oh no!", + *bail_literal().unwrap_err().downcast_ref::<&str>().unwrap(), + ); + assert_eq!( + "oh no!", + bail_fmt().unwrap_err().downcast_ref::().unwrap(), + ); + assert_eq!( + "oh no!", + bail_error() + .unwrap_err() + .downcast_ref::() + .unwrap() + .to_string(), + ); +} + +#[test] +fn test_downcast_mut() { + assert_eq!( + "oh no!", + *bail_literal().unwrap_err().downcast_mut::<&str>().unwrap(), + ); + assert_eq!( + "oh no!", + bail_fmt().unwrap_err().downcast_mut::().unwrap(), + ); + assert_eq!( + "oh no!", + bail_error() + .unwrap_err() + .downcast_mut::() + .unwrap() + .to_string(), + ); + + let mut bailed = bail_fmt().unwrap_err(); + *bailed.downcast_mut::().unwrap() = "clobber".to_string(); + assert_eq!(bailed.downcast_ref::().unwrap(), "clobber"); + assert_eq!(bailed.downcast_mut::().unwrap(), "clobber"); + assert_eq!(bailed.downcast::().unwrap(), "clobber"); +} + +#[test] +fn test_drop() { + let has_dropped = Flag::new(); + let error = Error::new(DetectDrop::new(&has_dropped)); + drop(error.downcast::().unwrap()); + assert!(has_dropped.get()); +} + +#[test] +fn test_as_ref() { + let error = bail_error().unwrap_err(); + let ref_dyn: &dyn StdError = error.as_ref(); + assert_eq!("oh no!", ref_dyn.to_string()); + let ref_dyn_send_sync: &(dyn StdError + Send + Sync) = error.as_ref(); + assert_eq!("oh no!", ref_dyn_send_sync.to_string()); +} + +#[test] +fn test_large_alignment() { + #[repr(align(64))] + #[derive(Debug)] + struct LargeAlignedError(&'static str); + + impl Display for LargeAlignedError { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.write_str(self.0) + } + } + + impl StdError for LargeAlignedError {} + + let error = Error::new(LargeAlignedError("oh no!")); + assert_eq!( + "oh no!", + error.downcast_ref::().unwrap().0 + ); +} + +#[test] +fn test_unsuccessful_downcast() { + let mut error = bail_error().unwrap_err(); + assert!(error.downcast_ref::<&str>().is_none()); + assert!(error.downcast_mut::<&str>().is_none()); + assert!(error.downcast::<&str>().is_err()); +} diff --git a/third_party/rust/anyhow/tests/test_ensure.rs b/third_party/rust/anyhow/tests/test_ensure.rs new file mode 100644 index 0000000000..de867f7fe8 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_ensure.rs @@ -0,0 +1,718 @@ +#![allow( + clippy::bool_to_int_with_if, + clippy::diverging_sub_expression, + clippy::if_same_then_else, + clippy::ifs_same_cond, + clippy::items_after_statements, + clippy::let_and_return, + clippy::match_bool, + clippy::never_loop, + clippy::overly_complex_bool_expr, + clippy::redundant_closure_call, + clippy::redundant_pattern_matching, + clippy::too_many_lines, + clippy::unit_arg, + clippy::while_immutable_condition, + clippy::zero_ptr, + irrefutable_let_patterns +)] + +use self::Enum::Generic; +use anyhow::{anyhow, ensure, Chain, Error, Result}; +use std::fmt::{self, Debug}; +use std::iter; +use std::marker::{PhantomData, PhantomData as P}; +use std::mem; +use std::ops::Add; +use std::ptr; + +struct S; + +impl Add for S { + type Output = bool; + fn add(self, rhs: T) -> Self::Output { + let _ = rhs; + false + } +} + +trait Trait: Sized { + const V: usize = 0; + fn t(self, i: i32) -> i32 { + i + } +} + +impl Trait for T {} + +enum Enum { + #[allow(dead_code)] + Thing(PhantomData), + Generic, +} + +impl PartialEq for Enum { + fn eq(&self, rhs: &Self) -> bool { + mem::discriminant(self) == mem::discriminant(rhs) + } +} + +impl Debug for Enum { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("Generic") + } +} + +#[track_caller] +fn assert_err(result: impl FnOnce() -> Result, expected: &'static str) { + let actual = result().unwrap_err().to_string(); + + // In general different rustc versions will format the interpolated lhs and + // rhs $:expr fragment with insignificant differences in whitespace or + // punctuation, so we check the message in full against nightly and do just + // a cursory test on older toolchains. + if rustversion::cfg!(nightly) && !cfg!(miri) { + assert_eq!(actual, expected); + } else { + assert_eq!(actual.contains(" vs "), expected.contains(" vs ")); + } +} + +#[test] +fn test_recursion() { + // Must not blow the default #[recursion_limit], which is 128. + #[rustfmt::skip] + let test = || Ok(ensure!( + false | false | false | false | false | false | false | false | false | + false | false | false | false | false | false | false | false | false | + false | false | false | false | false | false | false | false | false | + false | false | false | false | false | false | false | false | false | + false | false | false | false | false | false | false | false | false | + false | false | false | false | false | false | false | false | false | + false | false | false | false | false | false | false | false | false + )); + + test().unwrap_err(); +} + +#[test] +fn test_low_precedence_control_flow() { + #[allow(unreachable_code)] + let test = || { + let val = loop { + // Break has lower precedence than the comparison operators so the + // expression here is `S + (break (1 == 1))`. It would be bad if the + // ensure macro partitioned this input into `(S + break 1) == (1)` + // because that means a different thing than what was written. + ensure!(S + break 1 == 1); + }; + Ok(val) + }; + + assert!(test().unwrap()); +} + +#[test] +fn test_low_precedence_binary_operator() { + // Must not partition as `false == (true && false)`. + let test = || Ok(ensure!(false == true && false)); + assert_err(test, "Condition failed: `false == true && false`"); + + // But outside the root level, it is fine. + let test = || Ok(ensure!(while false == true && false {} < ())); + assert_err( + test, + "Condition failed: `while false == true && false {} < ()` (() vs ())", + ); +} + +#[test] +fn test_closure() { + // Must not partition as `(S + move) || (1 == 1)` by treating move as an + // identifier, nor as `(S + move || 1) == (1)` by misinterpreting the + // closure precedence. + let test = || Ok(ensure!(S + move || 1 == 1)); + assert_err(test, "Condition failed: `S + (move || 1 == 1)`"); + + let test = || Ok(ensure!(S + || 1 == 1)); + assert_err(test, "Condition failed: `S + (|| 1 == 1)`"); + + // Must not partition as `S + ((move | ()) | 1) == 1` by treating those + // pipes as bitwise-or. + let test = || Ok(ensure!(S + move |()| 1 == 1)); + assert_err(test, "Condition failed: `S + (move |()| 1 == 1)`"); + + let test = || Ok(ensure!(S + |()| 1 == 1)); + assert_err(test, "Condition failed: `S + (|()| 1 == 1)`"); +} + +#[test] +fn test_unary() { + let mut x = &1; + let test = || Ok(ensure!(*x == 2)); + assert_err(test, "Condition failed: `*x == 2` (1 vs 2)"); + + let test = || Ok(ensure!(!x == 1)); + assert_err(test, "Condition failed: `!x == 1` (-2 vs 1)"); + + let test = || Ok(ensure!(-x == 1)); + assert_err(test, "Condition failed: `-x == 1` (-1 vs 1)"); + + let test = || Ok(ensure!(&x == &&2)); + assert_err(test, "Condition failed: `&x == &&2` (1 vs 2)"); + + let test = || Ok(ensure!(&mut x == *&&mut &2)); + assert_err(test, "Condition failed: `&mut x == *&&mut &2` (1 vs 2)"); +} + +#[test] +fn test_if() { + #[rustfmt::skip] + let test = || Ok(ensure!(if false {}.t(1) == 2)); + assert_err(test, "Condition failed: `if false {}.t(1) == 2` (1 vs 2)"); + + #[rustfmt::skip] + let test = || Ok(ensure!(if false {} else {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `if false {} else {}.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(if false {} else if false {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `if false {} else if false {}.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(if let 1 = 2 {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `if let 1 = 2 {}.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(if let 1 | 2 = 2 {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `if let 1 | 2 = 2 {}.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(if let | 1 | 2 = 2 {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `if let 1 | 2 = 2 {}.t(1) == 2` (1 vs 2)", + ); +} + +#[test] +fn test_loop() { + #[rustfmt::skip] + let test = || Ok(ensure!(1 + loop { break 1 } == 1)); + assert_err( + test, + "Condition failed: `1 + loop { break 1 } == 1` (2 vs 1)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(1 + 'a: loop { break 'a 1 } == 1)); + assert_err( + test, + "Condition failed: `1 + 'a: loop { break 'a 1 } == 1` (2 vs 1)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(while false {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `while false {}.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(while let None = Some(1) {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `while let None = Some(1) {}.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(for _x in iter::once(0) {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `for _x in iter::once(0) {}.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(for | _x in iter::once(0) {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `for _x in iter::once(0) {}.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(for true | false in iter::empty() {}.t(1) == 2)); + assert_err( + test, + "Condition failed: `for true | false in iter::empty() {}.t(1) == 2` (1 vs 2)", + ); +} + +#[test] +fn test_match() { + #[rustfmt::skip] + let test = || Ok(ensure!(match 1 == 1 { true => 1, false => 0 } == 2)); + assert_err( + test, + "Condition failed: `match 1 == 1 { true => 1, false => 0, } == 2` (1 vs 2)", + ); +} + +#[test] +fn test_atom() { + let test = || Ok(ensure!([false, false].len() > 3)); + assert_err( + test, + "Condition failed: `[false, false].len() > 3` (2 vs 3)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!({ let x = 1; x } >= 3)); + assert_err(test, "Condition failed: `{ let x = 1; x } >= 3` (1 vs 3)"); + + let test = || Ok(ensure!(S + async { 1 } == true)); + assert_err( + test, + "Condition failed: `S + async { 1 } == true` (false vs true)", + ); + + let test = || Ok(ensure!(S + async move { 1 } == true)); + assert_err( + test, + "Condition failed: `S + async move { 1 } == true` (false vs true)", + ); + + let x = &1; + let test = || Ok(ensure!(S + unsafe { ptr::read(x) } == true)); + assert_err( + test, + "Condition failed: `S + unsafe { ptr::read(x) } == true` (false vs true)", + ); +} + +#[test] +fn test_path() { + let test = || Ok(ensure!(crate::S.t(1) == 2)); + assert_err(test, "Condition failed: `crate::S.t(1) == 2` (1 vs 2)"); + + let test = || Ok(ensure!(::anyhow::Error::root_cause.t(1) == 2)); + assert_err( + test, + "Condition failed: `::anyhow::Error::root_cause.t(1) == 2` (1 vs 2)", + ); + + let test = || Ok(ensure!(Error::msg::<&str>.t(1) == 2)); + assert_err( + test, + "Condition failed: `Error::msg::<&str>.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(Error::msg::<&str,>.t(1) == 2)); + assert_err( + test, + "Condition failed: `Error::msg::<&str>.t(1) == 2` (1 vs 2)", + ); + + let test = || Ok(ensure!(Error::msg::<::Owned>.t(1) == 2)); + assert_err( + test, + "Condition failed: `Error::msg::<::Owned>.t(1) == 2` (1 vs 2)", + ); + + let test = || Ok(ensure!(Chain::<'static>::new.t(1) == 2)); + assert_err( + test, + "Condition failed: `Chain::<'static>::new.t(1) == 2` (1 vs 2)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(Chain::<'static,>::new.t(1) == 2)); + assert_err( + test, + "Condition failed: `Chain::<'static>::new.t(1) == 2` (1 vs 2)", + ); + + fn f() {} + let test = || Ok(ensure!(f::<1>() != ())); + assert_err(test, "Condition failed: `f::<1>() != ()` (() vs ())"); + let test = || Ok(ensure!(f::<-1>() != ())); + assert_err(test, "Condition failed: `f::<-1>() != ()` (() vs ())"); + + fn g() {} + let test = || Ok(ensure!(g::() != ())); + assert_err(test, "Condition failed: `g::() != ()` (() vs ())"); + let test = || Ok(ensure!(g::() != ())); + assert_err(test, "Condition failed: `g::() != ()` (() vs ())"); + + #[derive(PartialOrd, PartialEq, Debug)] + enum E<'a, T> { + #[allow(dead_code)] + T(&'a T), + U, + } + + #[rustfmt::skip] + let test = || Ok(ensure!(E::U::<>>E::U::)); + assert_err(test, "Condition failed: `E::U::<> > E::U::` (U vs U)"); + + #[rustfmt::skip] + let test = || Ok(ensure!(E::U::>E::U)); + assert_err(test, "Condition failed: `E::U:: > E::U` (U vs U)"); + + #[rustfmt::skip] + let test = || Ok(ensure!(E::U::>E::U)); + assert_err(test, "Condition failed: `E::U:: > E::U` (U vs U)"); + + let test = || Ok(ensure!(Generic:: != Generic)); + assert_err( + test, + "Condition failed: `Generic:: != Generic` (Generic vs Generic)", + ); + + let test = || Ok(ensure!(Generic:: != Generic)); + assert_err( + test, + "Condition failed: `Generic:: != Generic` (Generic vs Generic)", + ); + + #[rustfmt::skip] + let test = || { + Ok(ensure!( + Generic:: != Generic + )) + }; + assert_err( + test, + "Condition failed: `Generic:: != Generic` (Generic vs Generic)", + ); +} + +#[test] +fn test_macro() { + let test = || Ok(ensure!(anyhow!("...").to_string().len() <= 1)); + assert_err( + test, + "Condition failed: `anyhow!(\"...\").to_string().len() <= 1` (3 vs 1)", + ); + + let test = || Ok(ensure!(vec![1].len() < 1)); + assert_err(test, "Condition failed: `vec![1].len() < 1` (1 vs 1)"); + + let test = || Ok(ensure!(stringify! {} != "")); + assert_err( + test, + "Condition failed: `stringify! {} != \"\"` (\"\" vs \"\")", + ); +} + +#[test] +fn test_trailer() { + let test = || Ok(ensure!((|| 1)() == 2)); + assert_err(test, "Condition failed: `(|| 1)() == 2` (1 vs 2)"); + + let test = || Ok(ensure!(b"hmm"[1] == b'c')); + assert_err(test, "Condition failed: `b\"hmm\"[1] == b'c'` (109 vs 99)"); + + let test = || Ok(ensure!(PhantomData:: {} != PhantomData)); + assert_err( + test, + "Condition failed: `PhantomData:: {} != PhantomData` (PhantomData vs PhantomData)", + ); + + let result = Ok::<_, Error>(1); + let test = || Ok(ensure!(result? == 2)); + assert_err(test, "Condition failed: `result? == 2` (1 vs 2)"); + + let test = || Ok(ensure!((2, 3).1 == 2)); + assert_err(test, "Condition failed: `(2, 3).1 == 2` (3 vs 2)"); + + #[rustfmt::skip] + let test = || Ok(ensure!((2, (3, 4)). 1.1 == 2)); + assert_err(test, "Condition failed: `(2, (3, 4)).1.1 == 2` (4 vs 2)"); + + let err = anyhow!(""); + let test = || Ok(ensure!(err.is::<&str>() == false)); + assert_err( + test, + "Condition failed: `err.is::<&str>() == false` (true vs false)", + ); + + let test = || Ok(ensure!(err.is::<::Owned>() == true)); + assert_err( + test, + "Condition failed: `err.is::<::Owned>() == true` (false vs true)", + ); +} + +#[test] +fn test_whitespace() { + #[derive(Debug)] + pub struct Point { + pub x: i32, + pub y: i32, + } + + let point = Point { x: 0, y: 0 }; + let test = || Ok(ensure!("" == format!("{:#?}", point))); + assert_err( + test, + "Condition failed: `\"\" == format!(\"{:#?}\", point)`", + ); +} + +#[test] +fn test_too_long() { + let test = || Ok(ensure!("" == "x".repeat(10))); + assert_err( + test, + "Condition failed: `\"\" == \"x\".repeat(10)` (\"\" vs \"xxxxxxxxxx\")", + ); + + let test = || Ok(ensure!("" == "x".repeat(80))); + assert_err(test, "Condition failed: `\"\" == \"x\".repeat(80)`"); +} + +#[test] +fn test_as() { + let test = || Ok(ensure!('\0' as u8 > 1)); + assert_err(test, "Condition failed: `'\\0' as u8 > 1` (0 vs 1)"); + + let test = || Ok(ensure!('\0' as ::std::primitive::u8 > 1)); + assert_err( + test, + "Condition failed: `'\\0' as ::std::primitive::u8 > 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(&[0] as &[i32] == [1])); + assert_err( + test, + "Condition failed: `&[0] as &[i32] == [1]` ([0] vs [1])", + ); + + let test = || Ok(ensure!(0 as *const () as *mut _ == 1 as *mut ())); + assert_err( + test, + "Condition failed: `0 as *const () as *mut _ == 1 as *mut ()` (0x0 vs 0x1)", + ); + + let s = ""; + let test = || Ok(ensure!(s as &str != s)); + assert_err(test, "Condition failed: `s as &str != s` (\"\" vs \"\")"); + + let test = || Ok(ensure!(&s as &&str != &s)); + assert_err(test, "Condition failed: `&s as &&str != &s` (\"\" vs \"\")"); + + let test = || Ok(ensure!(s as &'static str != s)); + assert_err( + test, + "Condition failed: `s as &'static str != s` (\"\" vs \"\")", + ); + + let test = || Ok(ensure!(&s as &&'static str != &s)); + assert_err( + test, + "Condition failed: `&s as &&'static str != &s` (\"\" vs \"\")", + ); + + let m: &mut str = Default::default(); + let test = || Ok(ensure!(m as &mut str != s)); + assert_err( + test, + "Condition failed: `m as &mut str != s` (\"\" vs \"\")", + ); + + let test = || Ok(ensure!(&m as &&mut str != &s)); + assert_err( + test, + "Condition failed: `&m as &&mut str != &s` (\"\" vs \"\")", + ); + + let test = || Ok(ensure!(&m as &&'static mut str != &s)); + assert_err( + test, + "Condition failed: `&m as &&'static mut str != &s` (\"\" vs \"\")", + ); + + let f = || {}; + let test = || Ok(ensure!(f as fn() as usize * 0 != 0)); + assert_err( + test, + "Condition failed: `f as fn() as usize * 0 != 0` (0 vs 0)", + ); + + let test = || Ok(ensure!(f as fn() -> () as usize * 0 != 0)); + assert_err( + test, + "Condition failed: `f as fn() -> () as usize * 0 != 0` (0 vs 0)", + ); + + let test = || Ok(ensure!(f as for<'a> fn() as usize * 0 != 0)); + assert_err( + test, + "Condition failed: `f as for<'a> fn() as usize * 0 != 0` (0 vs 0)", + ); + + let test = || Ok(ensure!(f as unsafe fn() as usize * 0 != 0)); + assert_err( + test, + "Condition failed: `f as unsafe fn() as usize * 0 != 0` (0 vs 0)", + ); + + #[rustfmt::skip] + let test = || Ok(ensure!(f as extern "Rust" fn() as usize * 0 != 0)); + assert_err( + test, + "Condition failed: `f as extern \"Rust\" fn() as usize * 0 != 0` (0 vs 0)", + ); + + extern "C" fn extern_fn() {} + #[rustfmt::skip] + let test = || Ok(ensure!(extern_fn as extern fn() as usize * 0 != 0)); + assert_err( + test, + "Condition failed: `extern_fn as extern fn() as usize * 0 != 0` (0 vs 0)", + ); + + let f = || -> ! { panic!() }; + let test = || Ok(ensure!(f as fn() -> ! as usize * 0 != 0)); + assert_err( + test, + "Condition failed: `f as fn() -> ! as usize * 0 != 0` (0 vs 0)", + ); + + trait EqDebug: PartialEq + Debug { + type Assoc; + } + + impl EqDebug for S + where + S: PartialEq + Debug, + { + type Assoc = bool; + } + + let test = || Ok(ensure!(&0 as &dyn EqDebug != &0)); + assert_err( + test, + "Condition failed: `&0 as &dyn EqDebug != &0` (0 vs 0)", + ); + + let test = || { + Ok(ensure!( + PhantomData as PhantomData<::Owned> != PhantomData + )) + }; + assert_err( + test, + "Condition failed: `PhantomData as PhantomData<::Owned> != PhantomData` (PhantomData vs PhantomData)", + ); + + macro_rules! int { + (...) => { + u8 + }; + } + + let test = || Ok(ensure!(0 as int!(...) != 0)); + assert_err(test, "Condition failed: `0 as int!(...) != 0` (0 vs 0)"); + + let test = || Ok(ensure!(0 as int![...] != 0)); + assert_err(test, "Condition failed: `0 as int![...] != 0` (0 vs 0)"); + + let test = || Ok(ensure!(0 as int! {...} != 0)); + assert_err(test, "Condition failed: `0 as int! { ... } != 0` (0 vs 0)"); +} + +#[test] +fn test_pat() { + let test = || Ok(ensure!(if let ref mut _x @ 0 = 0 { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let ref mut _x @ 0 = 0 { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(if let -1..=1 = 0 { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let -1..=1 = 0 { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(if let &0 = &0 { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let &0 = &0 { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(if let &&0 = &&0 { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let &&0 = &&0 { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(if let &mut 0 = &mut 0 { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let &mut 0 = &mut 0 { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(if let &&mut 0 = &&mut 0 { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let &&mut 0 = &&mut 0 { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(if let (0, 1) = (0, 1) { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let (0, 1) = (0, 1) { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(if let [0] = b"\0" { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let [0] = b\"\\0\" { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let p = PhantomData::; + let test = || Ok(ensure!(if let P:: {} = p { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let P:: {} = p { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(if let ::std::marker::PhantomData = p {} != ())); + assert_err( + test, + "Condition failed: `if let ::std::marker::PhantomData = p {} != ()` (() vs ())", + ); + + let test = || Ok(ensure!(if let ::V = 0 { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let ::V = 0 { 0 } else { 1 } == 1` (0 vs 1)", + ); + + let test = || Ok(ensure!(for _ in iter::once(()) {} != ())); + assert_err( + test, + "Condition failed: `for _ in iter::once(()) {} != ()` (() vs ())", + ); + + let test = || Ok(ensure!(if let stringify!(x) = "x" { 0 } else { 1 } == 1)); + assert_err( + test, + "Condition failed: `if let stringify!(x) = \"x\" { 0 } else { 1 } == 1` (0 vs 1)", + ); +} diff --git a/third_party/rust/anyhow/tests/test_ffi.rs b/third_party/rust/anyhow/tests/test_ffi.rs new file mode 100644 index 0000000000..0321fc1b05 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_ffi.rs @@ -0,0 +1,18 @@ +#![deny(improper_ctypes, improper_ctypes_definitions)] + +use anyhow::anyhow; + +#[no_mangle] +pub extern "C" fn anyhow1(err: anyhow::Error) { + println!("{:?}", err); +} + +#[no_mangle] +pub extern "C" fn anyhow2(err: &mut Option) { + *err = Some(anyhow!("ffi error")); +} + +#[no_mangle] +pub extern "C" fn anyhow3() -> Option { + Some(anyhow!("ffi error")) +} diff --git a/third_party/rust/anyhow/tests/test_fmt.rs b/third_party/rust/anyhow/tests/test_fmt.rs new file mode 100644 index 0000000000..cc4929197d --- /dev/null +++ b/third_party/rust/anyhow/tests/test_fmt.rs @@ -0,0 +1,94 @@ +use anyhow::{bail, Context, Result}; +use std::io; + +fn f() -> Result<()> { + bail!(io::Error::new(io::ErrorKind::PermissionDenied, "oh no!")); +} + +fn g() -> Result<()> { + f().context("f failed") +} + +fn h() -> Result<()> { + g().context("g failed") +} + +const EXPECTED_ALTDISPLAY_F: &str = "oh no!"; + +const EXPECTED_ALTDISPLAY_G: &str = "f failed: oh no!"; + +const EXPECTED_ALTDISPLAY_H: &str = "g failed: f failed: oh no!"; + +const EXPECTED_DEBUG_F: &str = "oh no!"; + +const EXPECTED_DEBUG_G: &str = "\ +f failed + +Caused by: + oh no!\ +"; + +const EXPECTED_DEBUG_H: &str = "\ +g failed + +Caused by: + 0: f failed + 1: oh no!\ +"; + +const EXPECTED_ALTDEBUG_F: &str = "\ +Custom { + kind: PermissionDenied, + error: \"oh no!\", +}\ +"; + +const EXPECTED_ALTDEBUG_G: &str = "\ +Error { + context: \"f failed\", + source: Custom { + kind: PermissionDenied, + error: \"oh no!\", + }, +}\ +"; + +const EXPECTED_ALTDEBUG_H: &str = "\ +Error { + context: \"g failed\", + source: Error { + context: \"f failed\", + source: Custom { + kind: PermissionDenied, + error: \"oh no!\", + }, + }, +}\ +"; + +#[test] +fn test_display() { + assert_eq!("g failed", h().unwrap_err().to_string()); +} + +#[test] +fn test_altdisplay() { + assert_eq!(EXPECTED_ALTDISPLAY_F, format!("{:#}", f().unwrap_err())); + assert_eq!(EXPECTED_ALTDISPLAY_G, format!("{:#}", g().unwrap_err())); + assert_eq!(EXPECTED_ALTDISPLAY_H, format!("{:#}", h().unwrap_err())); +} + +#[test] +#[cfg_attr(not(backtrace), ignore)] +fn test_debug() { + assert_eq!(EXPECTED_DEBUG_F, format!("{:?}", f().unwrap_err())); + assert_eq!(EXPECTED_DEBUG_G, format!("{:?}", g().unwrap_err())); + assert_eq!(EXPECTED_DEBUG_H, format!("{:?}", h().unwrap_err())); +} + +#[test] +fn test_altdebug() { + assert_eq!(EXPECTED_ALTDEBUG_F, format!("{:#?}", f().unwrap_err())); + assert_eq!(EXPECTED_ALTDEBUG_G, format!("{:#?}", g().unwrap_err())); + assert_eq!(EXPECTED_ALTDEBUG_H, format!("{:#?}", h().unwrap_err())); +} diff --git a/third_party/rust/anyhow/tests/test_macros.rs b/third_party/rust/anyhow/tests/test_macros.rs new file mode 100644 index 0000000000..a3342ab776 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_macros.rs @@ -0,0 +1,80 @@ +#![allow( + clippy::assertions_on_result_states, + clippy::eq_op, + clippy::items_after_statements, + clippy::needless_pass_by_value, + clippy::shadow_unrelated, + clippy::wildcard_imports +)] + +mod common; + +use self::common::*; +use anyhow::{anyhow, ensure}; +use std::cell::Cell; +use std::future; + +#[test] +fn test_messages() { + assert_eq!("oh no!", bail_literal().unwrap_err().to_string()); + assert_eq!("oh no!", bail_fmt().unwrap_err().to_string()); + assert_eq!("oh no!", bail_error().unwrap_err().to_string()); +} + +#[test] +fn test_ensure() { + let f = || { + ensure!(1 + 1 == 2, "This is correct"); + Ok(()) + }; + assert!(f().is_ok()); + + let v = 1; + let f = || { + ensure!(v + v == 2, "This is correct, v: {}", v); + Ok(()) + }; + assert!(f().is_ok()); + + let f = || { + ensure!(v + v == 1, "This is not correct, v: {}", v); + Ok(()) + }; + assert!(f().is_err()); + + let f = || { + ensure!(v + v == 1); + Ok(()) + }; + assert_eq!( + f().unwrap_err().to_string(), + "Condition failed: `v + v == 1` (2 vs 1)", + ); +} + +#[test] +fn test_temporaries() { + fn require_send_sync(_: impl Send + Sync) {} + + require_send_sync(async { + // If anyhow hasn't dropped any temporary format_args it creates by the + // time it's done evaluating, those will stick around until the + // semicolon, which is on the other side of the await point, making the + // enclosing future non-Send. + future::ready(anyhow!("...")).await; + }); + + fn message(cell: Cell<&str>) -> &str { + cell.get() + } + + require_send_sync(async { + future::ready(anyhow!(message(Cell::new("...")))).await; + }); +} + +#[test] +fn test_brace_escape() { + let err = anyhow!("unterminated ${{..}} expression"); + assert_eq!("unterminated ${..} expression", err.to_string()); +} diff --git a/third_party/rust/anyhow/tests/test_repr.rs b/third_party/rust/anyhow/tests/test_repr.rs new file mode 100644 index 0000000000..72f5002ae1 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_repr.rs @@ -0,0 +1,29 @@ +mod drop; + +use self::drop::{DetectDrop, Flag}; +use anyhow::Error; +use std::marker::Unpin; +use std::mem; + +#[test] +fn test_error_size() { + assert_eq!(mem::size_of::(), mem::size_of::()); +} + +#[test] +fn test_null_pointer_optimization() { + assert_eq!(mem::size_of::>(), mem::size_of::()); +} + +#[test] +fn test_autotraits() { + fn assert() {} + assert::(); +} + +#[test] +fn test_drop() { + let has_dropped = Flag::new(); + drop(Error::new(DetectDrop::new(&has_dropped))); + assert!(has_dropped.get()); +} diff --git a/third_party/rust/anyhow/tests/test_source.rs b/third_party/rust/anyhow/tests/test_source.rs new file mode 100644 index 0000000000..018267d315 --- /dev/null +++ b/third_party/rust/anyhow/tests/test_source.rs @@ -0,0 +1,62 @@ +use anyhow::anyhow; +use std::error::Error as StdError; +use std::fmt::{self, Display}; +use std::io; + +#[derive(Debug)] +enum TestError { + Io(io::Error), +} + +impl Display for TestError { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + match self { + TestError::Io(e) => Display::fmt(e, formatter), + } + } +} + +impl StdError for TestError { + fn source(&self) -> Option<&(dyn StdError + 'static)> { + match self { + TestError::Io(io) => Some(io), + } + } +} + +#[test] +fn test_literal_source() { + let error = anyhow!("oh no!"); + assert!(error.source().is_none()); +} + +#[test] +fn test_variable_source() { + let msg = "oh no!"; + let error = anyhow!(msg); + assert!(error.source().is_none()); + + let msg = msg.to_owned(); + let error = anyhow!(msg); + assert!(error.source().is_none()); +} + +#[test] +fn test_fmt_source() { + let error = anyhow!("{} {}!", "oh", "no"); + assert!(error.source().is_none()); +} + +#[test] +fn test_io_source() { + let io = io::Error::new(io::ErrorKind::Other, "oh no!"); + let error = anyhow!(TestError::Io(io)); + assert_eq!("oh no!", error.source().unwrap().to_string()); +} + +#[test] +fn test_anyhow_from_anyhow() { + let error = anyhow!("oh no!").context("context"); + let error = anyhow!(error); + assert_eq!("oh no!", error.source().unwrap().to_string()); +} diff --git a/third_party/rust/anyhow/tests/ui/chained-comparison.rs b/third_party/rust/anyhow/tests/ui/chained-comparison.rs new file mode 100644 index 0000000000..4521b51c8c --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/chained-comparison.rs @@ -0,0 +1,8 @@ +use anyhow::{ensure, Result}; + +fn main() -> Result<()> { + // `ensure!` must not partition this into `(false) == (false == true)` + // because Rust doesn't ordinarily allow this form of expression. + ensure!(false == false == true); + Ok(()) +} diff --git a/third_party/rust/anyhow/tests/ui/chained-comparison.stderr b/third_party/rust/anyhow/tests/ui/chained-comparison.stderr new file mode 100644 index 0000000000..2a4c66508a --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/chained-comparison.stderr @@ -0,0 +1,10 @@ +error: comparison operators cannot be chained + --> tests/ui/chained-comparison.rs:6:19 + | +6 | ensure!(false == false == true); + | ^^ ^^ + | +help: split the comparison into two + | +6 | ensure!(false == false && false == true); + | ++++++++ diff --git a/third_party/rust/anyhow/tests/ui/empty-ensure.rs b/third_party/rust/anyhow/tests/ui/empty-ensure.rs new file mode 100644 index 0000000000..139b743bbf --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/empty-ensure.rs @@ -0,0 +1,6 @@ +use anyhow::{ensure, Result}; + +fn main() -> Result<()> { + ensure!(); + Ok(()) +} diff --git a/third_party/rust/anyhow/tests/ui/empty-ensure.stderr b/third_party/rust/anyhow/tests/ui/empty-ensure.stderr new file mode 100644 index 0000000000..bf0229a2b2 --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/empty-ensure.stderr @@ -0,0 +1,12 @@ +error: unexpected end of macro invocation + --> tests/ui/empty-ensure.rs:4:5 + | +4 | ensure!(); + | ^^^^^^^^^ missing tokens in macro arguments + | +note: while trying to match meta-variable `$cond:expr` + --> src/ensure.rs + | + | ($cond:expr $(,)?) => { + | ^^^^^^^^^^ + = note: this error originates in the macro `$crate::__parse_ensure` which comes from the expansion of the macro `ensure` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/third_party/rust/anyhow/tests/ui/must-use.rs b/third_party/rust/anyhow/tests/ui/must-use.rs new file mode 100644 index 0000000000..ea4e58f55e --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/must-use.rs @@ -0,0 +1,11 @@ +#![deny(unused_must_use)] + +use anyhow::anyhow; + +fn main() -> anyhow::Result<()> { + if true { + // meant to write bail! + anyhow!("it failed"); + } + Ok(()) +} diff --git a/third_party/rust/anyhow/tests/ui/must-use.stderr b/third_party/rust/anyhow/tests/ui/must-use.stderr new file mode 100644 index 0000000000..e10bde40f7 --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/must-use.stderr @@ -0,0 +1,12 @@ +error: unused return value of `anyhow::__private::must_use` that must be used + --> tests/ui/must-use.rs:8:9 + | +8 | anyhow!("it failed"); + | ^^^^^^^^^^^^^^^^^^^^ + | +note: the lint level is defined here + --> tests/ui/must-use.rs:1:9 + | +1 | #![deny(unused_must_use)] + | ^^^^^^^^^^^^^^^ + = note: this error originates in the macro `anyhow` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/third_party/rust/anyhow/tests/ui/no-impl.rs b/third_party/rust/anyhow/tests/ui/no-impl.rs new file mode 100644 index 0000000000..d2e89afc1b --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/no-impl.rs @@ -0,0 +1,8 @@ +use anyhow::anyhow; + +#[derive(Debug)] +struct Error; + +fn main() { + let _ = anyhow!(Error); +} diff --git a/third_party/rust/anyhow/tests/ui/no-impl.stderr b/third_party/rust/anyhow/tests/ui/no-impl.stderr new file mode 100644 index 0000000000..1ddf768639 --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/no-impl.stderr @@ -0,0 +1,31 @@ +error[E0599]: the method `anyhow_kind` exists for reference `&Error`, but its trait bounds were not satisfied + --> tests/ui/no-impl.rs:7:13 + | +4 | struct Error; + | ------------ + | | + | doesn't satisfy `Error: Into` + | doesn't satisfy `Error: anyhow::kind::TraitKind` + | doesn't satisfy `Error: std::fmt::Display` +... +7 | let _ = anyhow!(Error); + | ^^^^^^^^^^^^^^ method cannot be called on `&Error` due to unsatisfied trait bounds + | + = note: the following trait bounds were not satisfied: + `Error: Into` + which is required by `Error: anyhow::kind::TraitKind` + `Error: std::fmt::Display` + which is required by `&Error: anyhow::kind::AdhocKind` + `&Error: Into` + which is required by `&Error: anyhow::kind::TraitKind` +note: the traits `Into` and `std::fmt::Display` must be implemented + --> $RUST/core/src/fmt/mod.rs + | + | pub trait Display { + | ^^^^^^^^^^^^^^^^^ + | + ::: $RUST/core/src/convert/mod.rs + | + | pub trait Into: Sized { + | ^^^^^^^^^^^^^^^^^^^^^^^^ + = note: this error originates in the macro `anyhow` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/third_party/rust/anyhow/tests/ui/temporary-value.rs b/third_party/rust/anyhow/tests/ui/temporary-value.rs new file mode 100644 index 0000000000..803809b238 --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/temporary-value.rs @@ -0,0 +1,5 @@ +use anyhow::anyhow; + +fn main() { + let _ = anyhow!(&String::new()); +} diff --git a/third_party/rust/anyhow/tests/ui/temporary-value.stderr b/third_party/rust/anyhow/tests/ui/temporary-value.stderr new file mode 100644 index 0000000000..dc27c4981f --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/temporary-value.stderr @@ -0,0 +1,9 @@ +error[E0716]: temporary value dropped while borrowed + --> tests/ui/temporary-value.rs:4:22 + | +4 | let _ = anyhow!(&String::new()); + | ---------^^^^^^^^^^^^^- + | | | + | | creates a temporary value which is freed while still in use + | temporary value is freed at the end of this statement + | argument requires that borrow lasts for `'static` diff --git a/third_party/rust/anyhow/tests/ui/wrong-interpolation.rs b/third_party/rust/anyhow/tests/ui/wrong-interpolation.rs new file mode 100644 index 0000000000..b870ca713d --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/wrong-interpolation.rs @@ -0,0 +1,5 @@ +use anyhow::{bail, Result}; + +fn main() -> Result<()> { + bail!("{} not found"); +} diff --git a/third_party/rust/anyhow/tests/ui/wrong-interpolation.stderr b/third_party/rust/anyhow/tests/ui/wrong-interpolation.stderr new file mode 100644 index 0000000000..55a2964113 --- /dev/null +++ b/third_party/rust/anyhow/tests/ui/wrong-interpolation.stderr @@ -0,0 +1,5 @@ +error: 1 positional argument in format string, but no arguments were given + --> tests/ui/wrong-interpolation.rs:4:12 + | +4 | bail!("{} not found"); + | ^^ -- cgit v1.2.3