Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

34 files changed, 2070 insertions, 0 deletions

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new file mode 100644
index 000000000..ed100925e
--- /dev/null
+++ b/vendor/displaydoc/CHANGELOG.md
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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+<!-- next-header -->
+
+## [Unreleased] - ReleaseDate
+
+# [0.2.3] - 2021-07-16
+## Added
+- Added `#[displaydoc("..")]` attribute for overriding a doc comment
+
+# [0.2.2] - 2021-07-01
+## Added
+- Added prefix feature to use the doc comment from an enum and prepend it
+  before the error message from each variant.
+
+# [0.2.1] - 2021-03-26
+## Added
+- Added opt in support for ignoring extra doc attributes
+
+# [0.2.0] - 2021-03-16
+## Changed
+
+- (BREAKING) disallow multiple `doc` attributes in display impl
+  [https://github.com/yaahc/displaydoc/pull/22]. Allowing and ignoring extra
+  doc attributes made it too easy to accidentally create a broken display
+  implementation with missing context without realizing it, this change turns
+  that into a hard error and directs users towards block comments if multiple
+  lines are needed.
+
+<!-- next-url -->
+[Unreleased]: https://github.com/yaahc/displaydoc/compare/v0.2.3...HEAD
+[0.2.3]: https://github.com/yaahc/displaydoc/compare/v0.2.2...v0.2.3
+[0.2.2]: https://github.com/yaahc/displaydoc/compare/v0.2.1...v0.2.2
+[0.2.1]: https://github.com/yaahc/displaydoc/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/yaahc/displaydoc/releases/tag/v0.2.0
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new file mode 100644
index 000000000..16fe87b06
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+                              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,
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+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
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+6. Trademarks. This License does not grant permission to use the trade
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+END OF TERMS AND CONDITIONS
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+Licensed under the Apache License, Version 2.0 (the "License");
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+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
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diff --git a/vendor/displaydoc/LICENSE-MIT b/vendor/displaydoc/LICENSE-MIT
new file mode 100644
index 000000000..31aa79387
--- /dev/null
+++ b/vendor/displaydoc/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/vendor/displaydoc/README.md b/vendor/displaydoc/README.md
new file mode 100644
index 000000000..990a1385e
--- /dev/null
+++ b/vendor/displaydoc/README.md
@@ -0,0 +1,99 @@
+derive(Display) /// `From<docs>`
+===============
+
+[![Latest Version](https://img.shields.io/crates/v/displaydoc.svg)](https://crates.io/crates/displaydoc)
+[![Rust Documentation](https://img.shields.io/badge/api-rustdoc-blue.svg)](https://docs.rs/displaydoc)
+
+This library provides a convenient derive macro for the standard library's
+[`core::fmt::Display`] trait.
+
+[`core::fmt::Display`]: https://doc.rust-lang.org/std/fmt/trait.Display.html
+
+```toml
+[dependencies]
+displaydoc = "0.2"
+```
+
+*Compiler support: requires rustc 1.31+*
+
+<br>
+
+### Example
+
+```rust
+use std::io;
+use displaydoc::Display;
+use thiserror::Error;
+
+#[derive(Display, Error, Debug)]
+pub enum DataStoreError {
+    /// data store disconnected
+    Disconnect(#[source] io::Error),
+    /// the data for key `{0}` is not available
+    Redaction(String),
+    /// invalid header (expected {expected:?}, found {found:?})
+    InvalidHeader {
+        expected: String,
+        found: String,
+    },
+    /// unknown data store error
+    Unknown,
+}
+```
+
+<br>
+
+### Details
+
+- A `Display` impl is generated for your type if you provide doc comment
+  messages on the struct or each variant of your enum, as shown above in the
+  example.
+
+  The messages support a shorthand for interpolating fields from the error.
+
+    - `/// {var}` ⟶ `write!("{}", self.var)`
+    - `/// {0}` ⟶ `write!("{}", self.0)`
+    - `/// {var:?}` ⟶ `write!("{:?}", self.var)`
+    - `/// {0:?}` ⟶ `write!("{:?}", self.0)`
+
+- Two optional attributes can be added to your types next to the derive:
+
+    - `#[ignore_extra_doc_attributes]` makes the macro ignore any doc
+      comment attributes (or `///` lines) after the first. Multi-line
+      comments using `///` are otherwise treated as an error, so use this
+      attribute or consider switching to block doc comments (`/** */`).
+
+    - `#[prefix_enum_doc_attributes]` combines the doc comment message on
+      your enum itself with the messages for each variant, in the format
+      “enum: variant”. When added to an enum, the doc comment on the enum
+      becomes mandatory. When added to any other type, it has no effect.
+
+- In case you want to have an independent doc comment, the
+  `#[displaydoc("...")` atrribute may be used on the variant or struct to
+  override it.
+
+<br>
+
+### FAQ
+
+1. **Is this crate `no_std` compatible?**
+    * Yes! This crate implements the `core::fmt::Display` trait not the `std::fmt::Display` trait so it should work in `std` and `no_std` environments. Just add `default-features = false`.
+
+2. **Does this crate work with `Path` and `PathBuf` via the `Display` trait?**
+    * Yuuup. This crate uses @dtolnay's [autoref specialization technique](https://github.com/dtolnay/case-studies/blob/master/autoref-specialization/README.md) to add a special trait for types to get the display impl, it then specializes for `Path` and `PathBuf` and when either of these types are found it calls `self.display()` to get a `std::path::Display<'_>` type which can be used with the Display format specifier!
+
+
+#### License
+
+<sup>
+Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
+2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
+</sup>
+
+<br>
+
+<sub>
+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.
+</sub>
diff --git a/vendor/displaydoc/README.tpl b/vendor/displaydoc/README.tpl
new file mode 100644
index 000000000..6206a9e7e
--- /dev/null
+++ b/vendor/displaydoc/README.tpl
@@ -0,0 +1,23 @@
+derive(Display) /// `From<docs>`
+===============
+
+[![Latest Version](https://img.shields.io/crates/v/displaydoc.svg)](https://crates.io/crates/displaydoc)
+[![Rust Documentation](https://img.shields.io/badge/api-rustdoc-blue.svg)](https://docs.rs/displaydoc)
+
+{{readme}}
+
+
+#### License
+
+<sup>
+Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
+2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
+</sup>
+
+<br>
+
+<sub>
+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.
+</sub>
diff --git a/vendor/displaydoc/examples/simple.rs b/vendor/displaydoc/examples/simple.rs
new file mode 100644
index 000000000..f4aad2131
--- /dev/null
+++ b/vendor/displaydoc/examples/simple.rs
@@ -0,0 +1,36 @@
+use displaydoc::Display;
+
+#[derive(Debug, Display)]
+pub enum DataStoreError {
+    /// data store disconnected
+    Disconnect,
+    /// the data for key `{0}` is not available
+    Redaction(String),
+    /// invalid header (expected {expected:?}, found {found:?})
+    InvalidHeader { expected: String, found: String },
+    /// unknown data store error
+    Unknown,
+}
+
+fn main() {
+    let disconnect = DataStoreError::Disconnect;
+    println!(
+        "Enum value `Disconnect` should be printed as:\n\t{}",
+        disconnect
+    );
+
+    let redaction = DataStoreError::Redaction(String::from("Dummy"));
+    println!(
+        "Enum value `Redaction` should be printed as:\n\t{}",
+        redaction
+    );
+
+    let invalid_header = DataStoreError::InvalidHeader {
+        expected: String::from("https"),
+        found: String::from("http"),
+    };
+    println!(
+        "Enum value `InvalidHeader` should be printed as:\n\t{}",
+        invalid_header
+    );
+}
diff --git a/vendor/displaydoc/src/attr.rs b/vendor/displaydoc/src/attr.rs
new file mode 100644
index 000000000..e14593556
--- /dev/null
+++ b/vendor/displaydoc/src/attr.rs
@@ -0,0 +1,134 @@
+use proc_macro2::TokenStream;
+use quote::{quote, ToTokens};
+use syn::{Attribute, LitStr, Meta, Result};
+
+#[derive(Clone)]
+pub(crate) struct Display {
+    pub(crate) fmt: LitStr,
+    pub(crate) args: TokenStream,
+}
+
+pub(crate) struct VariantDisplay {
+    pub(crate) r#enum: Option<Display>,
+    pub(crate) variant: Display,
+}
+
+impl ToTokens for Display {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        let fmt = &self.fmt;
+        let args = &self.args;
+        tokens.extend(quote! {
+            write!(formatter, #fmt #args)
+        });
+    }
+}
+
+impl ToTokens for VariantDisplay {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        if let Some(ref r#enum) = self.r#enum {
+            r#enum.to_tokens(tokens);
+            tokens.extend(quote! { ?; write!(formatter, ": ")?; });
+        }
+        self.variant.to_tokens(tokens);
+    }
+}
+
+pub(crate) struct AttrsHelper {
+    ignore_extra_doc_attributes: bool,
+    prefix_enum_doc_attributes: bool,
+}
+
+impl AttrsHelper {
+    pub(crate) fn new(attrs: &[Attribute]) -> Self {
+        let ignore_extra_doc_attributes = attrs
+            .iter()
+            .any(|attr| attr.path.is_ident("ignore_extra_doc_attributes"));
+        let prefix_enum_doc_attributes = attrs
+            .iter()
+            .any(|attr| attr.path.is_ident("prefix_enum_doc_attributes"));
+
+        Self {
+            ignore_extra_doc_attributes,
+            prefix_enum_doc_attributes,
+        }
+    }
+
+    pub(crate) fn display(&self, attrs: &[Attribute]) -> Result<Option<Display>> {
+        let displaydoc_attr = attrs.iter().find(|attr| attr.path.is_ident("displaydoc"));
+
+        if let Some(displaydoc_attr) = displaydoc_attr {
+            let lit = displaydoc_attr
+                .parse_args()
+                .expect("#[displaydoc(\"foo\")] must contain string arguments");
+            let mut display = Display {
+                fmt: lit,
+                args: TokenStream::new(),
+            };
+
+            display.expand_shorthand();
+            return Ok(Some(display));
+        }
+
+        let num_doc_attrs = attrs
+            .iter()
+            .filter(|attr| attr.path.is_ident("doc"))
+            .count();
+
+        if !self.ignore_extra_doc_attributes && num_doc_attrs > 1 {
+            panic!("Multi-line comments are disabled by default by displaydoc. Please consider using block doc comments (/** */) or adding the #[ignore_extra_doc_attributes] attribute to your type next to the derive.");
+        }
+
+        for attr in attrs {
+            if attr.path.is_ident("doc") {
+                let meta = attr.parse_meta()?;
+                let lit = match meta {
+                    Meta::NameValue(syn::MetaNameValue {
+                        lit: syn::Lit::Str(lit),
+                        ..
+                    }) => lit,
+                    _ => unimplemented!(),
+                };
+
+                // Make an attempt and cleaning up multiline doc comments
+                let doc_str = lit
+                    .value()
+                    .lines()
+                    .map(|line| line.trim().trim_start_matches('*').trim())
+                    .collect::<Vec<&str>>()
+                    .join("\n");
+
+                let lit = LitStr::new(doc_str.trim(), lit.span());
+
+                let mut display = Display {
+                    fmt: lit,
+                    args: TokenStream::new(),
+                };
+
+                display.expand_shorthand();
+                return Ok(Some(display));
+            }
+        }
+
+        Ok(None)
+    }
+
+    pub(crate) fn display_with_input(
+        &self,
+        r#enum: &[Attribute],
+        variant: &[Attribute],
+    ) -> Result<Option<VariantDisplay>> {
+        let r#enum = if self.prefix_enum_doc_attributes {
+            let result = self
+                .display(r#enum)?
+                .expect("Missing doc comment on enum with #[prefix_enum_doc_attributes]. Please remove the attribute or add a doc comment to the enum itself.");
+
+            Some(result)
+        } else {
+            None
+        };
+
+        Ok(self
+            .display(variant)?
+            .map(|variant| VariantDisplay { r#enum, variant }))
+    }
+}
diff --git a/vendor/displaydoc/src/expand.rs b/vendor/displaydoc/src/expand.rs
new file mode 100644
index 000000000..6904cbc8c
--- /dev/null
+++ b/vendor/displaydoc/src/expand.rs
@@ -0,0 +1,145 @@
+use super::attr::AttrsHelper;
+use proc_macro2::TokenStream;
+use quote::{format_ident, quote};
+use syn::{Data, DataEnum, DataStruct, DeriveInput, Error, Fields, Result};
+
+pub(crate) fn derive(input: &DeriveInput) -> Result<TokenStream> {
+    let impls = match &input.data {
+        Data::Struct(data) => impl_struct(input, data),
+        Data::Enum(data) => impl_enum(input, data),
+        Data::Union(_) => Err(Error::new_spanned(input, "Unions are not supported")),
+    }?;
+
+    let helpers = specialization();
+    let dummy_const = format_ident!("_DERIVE_Display_FOR_{}", input.ident);
+    Ok(quote! {
+        #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
+        const #dummy_const: () = {
+            #helpers
+            #impls
+        };
+    })
+}
+
+#[cfg(feature = "std")]
+fn specialization() -> TokenStream {
+    quote! {
+        trait DisplayToDisplayDoc {
+            fn __displaydoc_display(&self) -> Self;
+        }
+
+        impl<T: core::fmt::Display> DisplayToDisplayDoc for &T {
+            fn __displaydoc_display(&self) -> Self {
+                self
+            }
+        }
+
+        // If the `std` feature gets enabled we want to ensure that any crate
+        // using displaydoc can still reference the std crate, which is already
+        // being compiled in by whoever enabled the `std` feature in
+        // `displaydoc`, even if the crates using displaydoc are no_std.
+        extern crate std;
+
+        trait PathToDisplayDoc {
+            fn __displaydoc_display(&self) -> std::path::Display<'_>;
+        }
+
+        impl PathToDisplayDoc for std::path::Path {
+            fn __displaydoc_display(&self) -> std::path::Display<'_> {
+                self.display()
+            }
+        }
+
+        impl PathToDisplayDoc for std::path::PathBuf {
+            fn __displaydoc_display(&self) -> std::path::Display<'_> {
+                self.display()
+            }
+        }
+    }
+}
+
+#[cfg(not(feature = "std"))]
+fn specialization() -> TokenStream {
+    quote! {}
+}
+
+fn impl_struct(input: &DeriveInput, data: &DataStruct) -> Result<TokenStream> {
+    let ty = &input.ident;
+    let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
+
+    let helper = AttrsHelper::new(&input.attrs);
+
+    let display = helper.display(&input.attrs)?.map(|display| {
+        let pat = match &data.fields {
+            Fields::Named(fields) => {
+                let var = fields.named.iter().map(|field| &field.ident);
+                quote!(Self { #(#var),* })
+            }
+            Fields::Unnamed(fields) => {
+                let var = (0..fields.unnamed.len()).map(|i| format_ident!("_{}", i));
+                quote!(Self(#(#var),*))
+            }
+            Fields::Unit => quote!(_),
+        };
+        quote! {
+            impl #impl_generics core::fmt::Display for #ty #ty_generics #where_clause {
+                fn fmt(&self, formatter: &mut core::fmt::Formatter) -> core::fmt::Result {
+                    #[allow(unused_variables)]
+                    let #pat = self;
+                    #display
+                }
+            }
+        }
+    });
+
+    Ok(quote! { #display })
+}
+
+fn impl_enum(input: &DeriveInput, data: &DataEnum) -> Result<TokenStream> {
+    let ty = &input.ident;
+    let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
+
+    let helper = AttrsHelper::new(&input.attrs);
+
+    let displays = data
+        .variants
+        .iter()
+        .map(|variant| helper.display_with_input(&input.attrs, &variant.attrs))
+        .collect::<Result<Vec<_>>>()?;
+
+    if displays.iter().any(Option::is_some) {
+        let arms = data
+            .variants
+            .iter()
+            .zip(displays)
+            .map(|(variant, display)| {
+                let display =
+                    display.ok_or_else(|| Error::new_spanned(variant, "missing doc comment"))?;
+                let ident = &variant.ident;
+                Ok(match &variant.fields {
+                    Fields::Named(fields) => {
+                        let var = fields.named.iter().map(|field| &field.ident);
+                        quote!(#ty::#ident { #(#var),* } => { #display })
+                    }
+                    Fields::Unnamed(fields) => {
+                        let var = (0..fields.unnamed.len()).map(|i| format_ident!("_{}", i));
+                        quote!(#ty::#ident(#(#var),*) => { #display })
+                    }
+                    Fields::Unit => quote!(#ty::#ident => { #display }),
+                })
+            })
+            .collect::<Result<Vec<_>>>()?;
+        Ok(quote! {
+            impl #impl_generics core::fmt::Display for #ty #ty_generics #where_clause {
+                fn fmt(&self, formatter: &mut core::fmt::Formatter) -> core::fmt::Result {
+                    #[allow(unused_variables)]
+                    match self {
+                        #(#arms,)*
+                    }
+                }
+            }
+        })
+    } else {
+        Err(Error::new_spanned(input, "Missing doc comments"))
+    }
+}
diff --git a/vendor/displaydoc/src/fmt.rs b/vendor/displaydoc/src/fmt.rs
new file mode 100644
index 000000000..5848557ea
--- /dev/null
+++ b/vendor/displaydoc/src/fmt.rs
@@ -0,0 +1,159 @@
+use crate::attr::Display;
+use proc_macro2::TokenStream;
+use quote::quote_spanned;
+use syn::{Ident, LitStr};
+
+macro_rules! peek_next {
+    ($read:ident) => {
+        match $read.chars().next() {
+            Some(next) => next,
+            None => return,
+        }
+    };
+}
+
+impl Display {
+    // Transform `"error {var}"` to `"error {}", var`.
+    pub(crate) fn expand_shorthand(&mut self) {
+        let span = self.fmt.span();
+        let fmt = self.fmt.value();
+        let mut read = fmt.as_str();
+        let mut out = String::new();
+        let mut args = TokenStream::new();
+
+        while let Some(brace) = read.find('{') {
+            out += &read[..=brace];
+            read = &read[brace + 1..];
+
+            // skip cases where we find a {{
+            if read.starts_with('{') {
+                out.push('{');
+                read = &read[1..];
+                continue;
+            }
+
+            let next = peek_next!(read);
+
+            let var = match next {
+                '0'..='9' => take_int(&mut read),
+                'a'..='z' | 'A'..='Z' | '_' => take_ident(&mut read),
+                _ => return,
+            };
+
+            let ident = Ident::new(&var, span);
+
+            let next = peek_next!(read);
+
+            let arg = if cfg!(feature = "std") && next == '}' {
+                quote_spanned!(span=> , #ident.__displaydoc_display())
+            } else {
+                quote_spanned!(span=> , #ident)
+            };
+
+            args.extend(arg);
+        }
+
+        out += read;
+        self.fmt = LitStr::new(&out, self.fmt.span());
+        self.args = args;
+    }
+}
+
+fn take_int(read: &mut &str) -> String {
+    let mut int = String::new();
+    int.push('_');
+    for (i, ch) in read.char_indices() {
+        match ch {
+            '0'..='9' => int.push(ch),
+            _ => {
+                *read = &read[i..];
+                break;
+            }
+        }
+    }
+    int
+}
+
+fn take_ident(read: &mut &str) -> String {
+    let mut ident = String::new();
+    for (i, ch) in read.char_indices() {
+        match ch {
+            'a'..='z' | 'A'..='Z' | '0'..='9' | '_' => ident.push(ch),
+            _ => {
+                *read = &read[i..];
+                break;
+            }
+        }
+    }
+    ident
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use pretty_assertions::assert_eq;
+    use proc_macro2::Span;
+
+    fn assert(input: &str, fmt: &str, args: &str) {
+        let mut display = Display {
+            fmt: LitStr::new(input, Span::call_site()),
+            args: TokenStream::new(),
+        };
+        display.expand_shorthand();
+        assert_eq!(fmt, display.fmt.value());
+        assert_eq!(args, display.args.to_string());
+    }
+
+    #[test]
+    fn test_expand() {
+        assert("fn main() {{ }}", "fn main() {{ }}", "");
+    }
+
+    #[test]
+    #[cfg_attr(not(feature = "std"), ignore)]
+    fn test_std_expand() {
+        assert(
+            "{v} {v:?} {0} {0:?}",
+            "{} {:?} {} {:?}",
+            ", v . __displaydoc_display () , v , _0 . __displaydoc_display () , _0",
+        );
+        assert("error {var}", "error {}", ", var . __displaydoc_display ()");
+
+        assert(
+            "error {var1}",
+            "error {}",
+            ", var1 . __displaydoc_display ()",
+        );
+
+        assert(
+            "error {var1var}",
+            "error {}",
+            ", var1var . __displaydoc_display ()",
+        );
+
+        assert(
+            "The path {0}",
+            "The path {}",
+            ", _0 . __displaydoc_display ()",
+        );
+        assert("The path {0:?}", "The path {:?}", ", _0");
+    }
+
+    #[test]
+    #[cfg_attr(feature = "std", ignore)]
+    fn test_nostd_expand() {
+        assert(
+            "{v} {v:?} {0} {0:?}",
+            "{} {:?} {} {:?}",
+            ", v , v , _0 , _0",
+        );
+        assert("error {var}", "error {}", ", var");
+
+        assert("The path {0}", "The path {}", ", _0");
+        assert("The path {0:?}", "The path {:?}", ", _0");
+
+        assert("error {var1}", "error {}", ", var1");
+
+        assert("error {var1var}", "error {}", ", var1var");
+    }
+}
diff --git a/vendor/displaydoc/src/lib.rs b/vendor/displaydoc/src/lib.rs
new file mode 100644
index 000000000..083c61384
--- /dev/null
+++ b/vendor/displaydoc/src/lib.rs
@@ -0,0 +1,122 @@
+//! This library provides a convenient derive macro for the standard library's
+//! [`core::fmt::Display`] trait.
+//!
+//! [`core::fmt::Display`]: https://doc.rust-lang.org/std/fmt/trait.Display.html
+//!
+//! ```toml
+//! [dependencies]
+//! displaydoc = "0.2"
+//! ```
+//!
+//! *Compiler support: requires rustc 1.31+*
+//!
+//! <br>
+//!
+//! ## Example
+//!
+//! ```rust
+//! use std::io;
+//! use displaydoc::Display;
+//! use thiserror::Error;
+//!
+//! #[derive(Display, Error, Debug)]
+//! pub enum DataStoreError {
+//!     /// data store disconnected
+//!     Disconnect(#[source] io::Error),
+//!     /// the data for key `{0}` is not available
+//!     Redaction(String),
+//!     /// invalid header (expected {expected:?}, found {found:?})
+//!     InvalidHeader {
+//!         expected: String,
+//!         found: String,
+//!     },
+//!     /// unknown data store error
+//!     Unknown,
+//! }
+//! ```
+//!
+//! <br>
+//!
+//! ## Details
+//!
+//! - A `Display` impl is generated for your type if you provide doc comment
+//!   messages on the struct or each variant of your enum, as shown above in the
+//!   example.
+//!
+//!   The messages support a shorthand for interpolating fields from the error.
+//!
+//!     - `/// {var}` ⟶ `write!("{}", self.var)`
+//!     - `/// {0}` ⟶ `write!("{}", self.0)`
+//!     - `/// {var:?}` ⟶ `write!("{:?}", self.var)`
+//!     - `/// {0:?}` ⟶ `write!("{:?}", self.0)`
+//!
+//! - Two optional attributes can be added to your types next to the derive:
+//!
+//!     - `#[ignore_extra_doc_attributes]` makes the macro ignore any doc
+//!       comment attributes (or `///` lines) after the first. Multi-line
+//!       comments using `///` are otherwise treated as an error, so use this
+//!       attribute or consider switching to block doc comments (`/** */`).
+//!
+//!     - `#[prefix_enum_doc_attributes]` combines the doc comment message on
+//!       your enum itself with the messages for each variant, in the format
+//!       “enum: variant”. When added to an enum, the doc comment on the enum
+//!       becomes mandatory. When added to any other type, it has no effect.
+//!
+//! - In case you want to have an independent doc comment, the
+//!   `#[displaydoc("...")` atrribute may be used on the variant or struct to
+//!   override it.
+//!
+//! <br>
+//!
+//! ## FAQ
+//!
+//! 1. **Is this crate `no_std` compatible?**
+//!     * Yes! This crate implements the `core::fmt::Display` trait not the `std::fmt::Display` trait so it should work in `std` and `no_std` environments. Just add `default-features = false`.
+//!
+//! 2. **Does this crate work with `Path` and `PathBuf` via the `Display` trait?**
+//!     * Yuuup. This crate uses @dtolnay's [autoref specialization technique](https://github.com/dtolnay/case-studies/blob/master/autoref-specialization/README.md) to add a special trait for types to get the display impl, it then specializes for `Path` and `PathBuf` and when either of these types are found it calls `self.display()` to get a `std::path::Display<'_>` type which can be used with the Display format specifier!
+#![doc(html_root_url = "https://docs.rs/displaydoc/0.2.3")]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![warn(
+    rust_2018_idioms,
+    unreachable_pub,
+    bad_style,
+    const_err,
+    dead_code,
+    improper_ctypes,
+    non_shorthand_field_patterns,
+    no_mangle_generic_items,
+    overflowing_literals,
+    path_statements,
+    patterns_in_fns_without_body,
+    private_in_public,
+    unconditional_recursion,
+    unused,
+    unused_allocation,
+    unused_comparisons,
+    unused_parens,
+    while_true
+)]
+#![allow(clippy::try_err)]
+
+#[allow(unused_extern_crates)]
+extern crate proc_macro;
+
+mod attr;
+mod expand;
+mod fmt;
+
+use proc_macro::TokenStream;
+use syn::{parse_macro_input, DeriveInput};
+
+/// Derive macro for implementing `Display` via doc comment attributes
+#[proc_macro_derive(
+    Display,
+    attributes(ignore_extra_doc_attributes, prefix_enum_doc_attributes, displaydoc)
+)]
+pub fn derive_error(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+    expand::derive(&input)
+        .unwrap_or_else(|err| err.to_compile_error())
+        .into()
+}
diff --git a/vendor/displaydoc/tests/compile_tests.rs b/vendor/displaydoc/tests/compile_tests.rs
new file mode 100644
index 000000000..29c72a862
--- /dev/null
+++ b/vendor/displaydoc/tests/compile_tests.rs
@@ -0,0 +1,29 @@
+#[allow(unused_attributes)]
+#[rustversion::attr(not(nightly), ignore)]
+#[test]
+fn no_std() {
+    let t = trybuild::TestCases::new();
+    #[cfg(not(feature = "std"))]
+    t.compile_fail("tests/no_std/without.rs");
+    #[cfg(not(feature = "std"))]
+    t.compile_fail("tests/no_std/multi_line.rs");
+    #[cfg(not(feature = "std"))]
+    t.pass("tests/no_std/multi_line_allow.rs");
+    #[cfg(not(feature = "std"))]
+    t.compile_fail("tests/no_std/enum_prefix_missing.rs");
+    #[cfg(not(feature = "std"))]
+    t.pass("tests/no_std/enum_prefix.rs");
+    #[cfg(feature = "std")]
+    t.compile_fail("tests/std/without.rs");
+    #[cfg(feature = "std")]
+    t.compile_fail("tests/std/multi_line.rs");
+    #[cfg(feature = "std")]
+    t.pass("tests/std/multi_line_allow.rs");
+    #[cfg(feature = "std")]
+    t.compile_fail("tests/std/enum_prefix_missing.rs");
+    #[cfg(feature = "std")]
+    t.pass("tests/std/enum_prefix.rs");
+    #[cfg(feature = "std")]
+    t.pass("tests/std/multiple.rs");
+    t.pass("tests/no_std/with.rs");
+}
diff --git a/vendor/displaydoc/tests/happy.rs b/vendor/displaydoc/tests/happy.rs
new file mode 100644
index 000000000..85aa78f13
--- /dev/null
+++ b/vendor/displaydoc/tests/happy.rs
@@ -0,0 +1,152 @@
+use displaydoc::Display;
+
+#[cfg(feature = "std")]
+use std::path::PathBuf;
+
+#[derive(Display)]
+/// Just a basic struct {thing}
+struct HappyStruct {
+    thing: &'static str,
+}
+
+#[derive(Display)]
+#[ignore_extra_doc_attributes]
+/// Just a basic struct {thing}
+/// and this line should get ignored
+struct HappyStruct2 {
+    thing: &'static str,
+}
+
+#[derive(Display)]
+enum Happy {
+    /// I really like Variant1
+    Variant1,
+    /// Variant2 is pretty swell 2
+    Variant2,
+    /// Variant3 is okay {sometimes}
+    Variant3 { sometimes: &'static str },
+    /**
+     * Variant4 wants to have a lot of lines
+     *
+     * Lets see how this works out for it
+     */
+    Variant4,
+    /// Variant5 has a parameter {0} and some regular comments
+    // A regular comment that won't get picked
+    Variant5(u32),
+
+    /// The path {0}
+    #[cfg(feature = "std")]
+    Variant6(PathBuf),
+
+    /// These docs are ignored
+    #[displaydoc("Variant7 has a parameter {0} and uses #[displaydoc]")]
+    /// These docs are also ignored
+    Variant7(u32),
+}
+
+// Used for testing indented doc comments
+mod inner_mod {
+    use super::Display;
+
+    #[derive(Display)]
+    pub enum InnerHappy {
+        /// I really like Variant1
+        Variant1,
+        /// Variant2 is pretty swell 2
+        Variant2,
+        /// Variant3 is okay {sometimes}
+        Variant3 { sometimes: &'static str },
+        /**
+         * Variant4 wants to have a lot of lines
+         *
+         * Lets see how this works out for it
+         */
+        Variant4,
+        /// Variant5 has a parameter {0} and some regular comments
+        // A regular comment that won't get picked
+        Variant5(u32),
+
+        /** what happens if we
+         * put text on the first line?
+         */
+        Variant6,
+
+        /**
+        what happens if we don't use *?
+        */
+        Variant7,
+
+        /**
+         *
+         * what about extra new lines?
+         */
+        Variant8,
+    }
+}
+
+fn assert_display<T: std::fmt::Display>(input: T, expected: &'static str) {
+    let out = format!("{}", input);
+    assert_eq!(expected, out);
+}
+
+#[test]
+fn does_it_print() {
+    assert_display(Happy::Variant1, "I really like Variant1");
+    assert_display(Happy::Variant2, "Variant2 is pretty swell 2");
+    assert_display(Happy::Variant3 { sometimes: "hi" }, "Variant3 is okay hi");
+    assert_display(
+        Happy::Variant4,
+        "Variant4 wants to have a lot of lines\n\nLets see how this works out for it",
+    );
+    assert_display(
+        Happy::Variant5(2),
+        "Variant5 has a parameter 2 and some regular comments",
+    );
+    assert_display(
+        Happy::Variant7(2),
+        "Variant7 has a parameter 2 and uses #[displaydoc]",
+    );
+    assert_display(HappyStruct { thing: "hi" }, "Just a basic struct hi");
+
+    assert_display(HappyStruct2 { thing: "hi2" }, "Just a basic struct hi2");
+
+    assert_display(inner_mod::InnerHappy::Variant1, "I really like Variant1");
+    assert_display(
+        inner_mod::InnerHappy::Variant2,
+        "Variant2 is pretty swell 2",
+    );
+    assert_display(
+        inner_mod::InnerHappy::Variant3 { sometimes: "hi" },
+        "Variant3 is okay hi",
+    );
+    assert_display(
+        inner_mod::InnerHappy::Variant4,
+        "Variant4 wants to have a lot of lines\n\nLets see how this works out for it",
+    );
+    assert_display(
+        inner_mod::InnerHappy::Variant5(2),
+        "Variant5 has a parameter 2 and some regular comments",
+    );
+    assert_display(
+        inner_mod::InnerHappy::Variant6,
+        "what happens if we\nput text on the first line?",
+    );
+    assert_display(
+        inner_mod::InnerHappy::Variant7,
+        "what happens if we don\'t use *?",
+    );
+    assert_display(
+        inner_mod::InnerHappy::Variant8,
+        "what about extra new lines?",
+    );
+}
+
+#[test]
+#[cfg(feature = "std")]
+fn does_it_print_path() {
+    assert_display(
+        Happy::Variant6(PathBuf::from("/var/log/happy")),
+        "The path /var/log/happy",
+    );
+}
diff --git a/vendor/displaydoc/tests/no_std/enum_prefix.rs b/vendor/displaydoc/tests/no_std/enum_prefix.rs
new file mode 100644
index 000000000..1c5479118
--- /dev/null
+++ b/vendor/displaydoc/tests/no_std/enum_prefix.rs
@@ -0,0 +1,36 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+#[derive(Display)]
+#[prefix_enum_doc_attributes]
+enum TestType {
+    /// this variant is too
+    Variant1,
+
+    /// this variant is two
+    Variant2,
+}
+
+static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/no_std/enum_prefix_missing.rs b/vendor/displaydoc/tests/no_std/enum_prefix_missing.rs
new file mode 100644
index 000000000..5cd9e6df8
--- /dev/null
+++ b/vendor/displaydoc/tests/no_std/enum_prefix_missing.rs
@@ -0,0 +1,35 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+#[derive(Display)]
+#[prefix_enum_doc_attributes]
+enum TestType {
+    /// this variant is too
+    Variant1,
+
+    /// this variant is two
+    Variant2,
+}
+
+static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/no_std/enum_prefix_missing.stderr b/vendor/displaydoc/tests/no_std/enum_prefix_missing.stderr
new file mode 100644
index 000000000..a0db21694
--- /dev/null
+++ b/vendor/displaydoc/tests/no_std/enum_prefix_missing.stderr
@@ -0,0 +1,19 @@
+error: proc-macro derive panicked
+  --> $DIR/enum_prefix_missing.rs:22:10
+   |
+22 | #[derive(Display)]
+   |          ^^^^^^^
+   |
+   = help: message: Missing doc comment on enum with #[prefix_enum_doc_attributes]. Please remove the attribute or add a doc comment to the enum itself.
+
+error[E0277]: `TestType` doesn't implement `Display`
+  --> $DIR/enum_prefix_missing.rs:32:44
+   |
+32 | static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+   | -------------------------------------------^^^^^^^^----------------------
+   | |                                          |
+   | |                                          `TestType` cannot be formatted with the default formatter
+   | required by this bound in `assert_impl_all`
+   |
+   = help: the trait `Display` is not implemented for `TestType`
+   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
diff --git a/vendor/displaydoc/tests/no_std/multi_line.rs b/vendor/displaydoc/tests/no_std/multi_line.rs
new file mode 100644
index 000000000..cadb83e70
--- /dev/null
+++ b/vendor/displaydoc/tests/no_std/multi_line.rs
@@ -0,0 +1,37 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+#[derive(Display)]
+enum TestType {
+    /// This one is okay
+    Variant1,
+
+    /// Multi
+    /// line
+    /// doc.
+    Variant2,
+}
+
+static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/no_std/multi_line.stderr b/vendor/displaydoc/tests/no_std/multi_line.stderr
new file mode 100644
index 000000000..e23d134c8
--- /dev/null
+++ b/vendor/displaydoc/tests/no_std/multi_line.stderr
@@ -0,0 +1,19 @@
+error: proc-macro derive panicked
+  --> $DIR/multi_line.rs:23:10
+   |
+23 | #[derive(Display)]
+   |          ^^^^^^^
+   |
+   = help: message: Multi-line comments are disabled by default by displaydoc. Please consider using block doc comments (/** */) or adding the #[ignore_extra_doc_attributes] attribute to your type next to the derive.
+
+error[E0277]: `TestType` doesn't implement `Display`
+  --> $DIR/multi_line.rs:34:44
+   |
+34 | static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+   | -------------------------------------------^^^^^^^^----------------------
+   | |                                          |
+   | |                                          `TestType` cannot be formatted with the default formatter
+   | required by this bound in `assert_impl_all`
+   |
+   = help: the trait `Display` is not implemented for `TestType`
+   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
diff --git a/vendor/displaydoc/tests/no_std/multi_line_allow.rs b/vendor/displaydoc/tests/no_std/multi_line_allow.rs
new file mode 100644
index 000000000..05bdcf9fb
--- /dev/null
+++ b/vendor/displaydoc/tests/no_std/multi_line_allow.rs
@@ -0,0 +1,38 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+#[derive(Display)]
+#[ignore_extra_doc_attributes]
+enum TestType {
+    /// This one is okay
+    Variant1,
+
+    /// Multi
+    /// line
+    /// doc.
+    Variant2,
+}
+
+static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/no_std/with.rs b/vendor/displaydoc/tests/no_std/with.rs
new file mode 100644
index 000000000..7de3da67f
--- /dev/null
+++ b/vendor/displaydoc/tests/no_std/with.rs
@@ -0,0 +1,32 @@
+#![feature(lang_items, start)]
+#![no_std]
+
+#[start]
+#[cfg(not(feature = "std"))]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+#[cfg(feature = "std")]
+fn main() {}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+#[derive(Display)]
+struct FakeType;
+
+static_assertions::assert_impl_all!(label; FakeType, core::fmt::Display);
diff --git a/vendor/displaydoc/tests/no_std/without.rs b/vendor/displaydoc/tests/no_std/without.rs
new file mode 100644
index 000000000..32905aad9
--- /dev/null
+++ b/vendor/displaydoc/tests/no_std/without.rs
@@ -0,0 +1,28 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+struct FakeType;
+
+static_assertions::assert_impl_all!(label; FakeType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/no_std/without.stderr b/vendor/displaydoc/tests/no_std/without.stderr
new file mode 100644
index 000000000..81de13b74
--- /dev/null
+++ b/vendor/displaydoc/tests/no_std/without.stderr
@@ -0,0 +1,19 @@
+warning: unused import: `displaydoc::Display`
+  --> $DIR/without.rs:20:5
+   |
+20 | use displaydoc::Display;
+   |     ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(unused_imports)]` on by default
+
+error[E0277]: `FakeType` doesn't implement `Display`
+  --> $DIR/without.rs:25:44
+   |
+25 | static_assertions::assert_impl_all!(label; FakeType, core::fmt::Display);
+   | -------------------------------------------^^^^^^^^----------------------
+   | |                                          |
+   | |                                          `FakeType` cannot be formatted with the default formatter
+   | required by this bound in `assert_impl_all`
+   |
+   = help: the trait `Display` is not implemented for `FakeType`
+   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
diff --git a/vendor/displaydoc/tests/num_in_field.rs b/vendor/displaydoc/tests/num_in_field.rs
new file mode 100644
index 000000000..9510f8206
--- /dev/null
+++ b/vendor/displaydoc/tests/num_in_field.rs
@@ -0,0 +1,22 @@
+/// {foo1} {foo2}
+#[derive(displaydoc::Display)]
+pub struct Test {
+    foo1: String,
+    foo2: String,
+}
+
+fn assert_display<T: std::fmt::Display>(input: T, expected: &'static str) {
+    let out = format!("{}", input);
+    assert_eq!(expected, out);
+}
+
+#[test]
+fn does_it_print() {
+    assert_display(
+        Test {
+            foo1: "hi".into(),
+            foo2: "hello".into(),
+        },
+        "hi hello",
+    );
+}
diff --git a/vendor/displaydoc/tests/std/enum_prefix.rs b/vendor/displaydoc/tests/std/enum_prefix.rs
new file mode 100644
index 000000000..1c5479118
--- /dev/null
+++ b/vendor/displaydoc/tests/std/enum_prefix.rs
@@ -0,0 +1,36 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+#[derive(Display)]
+#[prefix_enum_doc_attributes]
+enum TestType {
+    /// this variant is too
+    Variant1,
+
+    /// this variant is two
+    Variant2,
+}
+
+static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/std/enum_prefix_missing.rs b/vendor/displaydoc/tests/std/enum_prefix_missing.rs
new file mode 100644
index 000000000..5cd9e6df8
--- /dev/null
+++ b/vendor/displaydoc/tests/std/enum_prefix_missing.rs
@@ -0,0 +1,35 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+#[derive(Display)]
+#[prefix_enum_doc_attributes]
+enum TestType {
+    /// this variant is too
+    Variant1,
+
+    /// this variant is two
+    Variant2,
+}
+
+static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/std/enum_prefix_missing.stderr b/vendor/displaydoc/tests/std/enum_prefix_missing.stderr
new file mode 100644
index 000000000..7f60f1bf5
--- /dev/null
+++ b/vendor/displaydoc/tests/std/enum_prefix_missing.stderr
@@ -0,0 +1,19 @@
+error: proc-macro derive panicked
+  --> $DIR/enum_prefix_missing.rs:22:10
+   |
+22 | #[derive(Display)]
+   |          ^^^^^^^
+   |
+   = help: message: Missing doc comment on enum with #[prefix_enum_doc_attributes]. Please remove the attribute or add a doc comment to the enum itself.
+
+error[E0277]: `TestType` doesn't implement `std::fmt::Display`
+  --> $DIR/enum_prefix_missing.rs:32:44
+   |
+32 | static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+   | -------------------------------------------^^^^^^^^----------------------
+   | |                                          |
+   | |                                          `TestType` cannot be formatted with the default formatter
+   | required by this bound in `assert_impl_all`
+   |
+   = help: the trait `std::fmt::Display` is not implemented for `TestType`
+   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
diff --git a/vendor/displaydoc/tests/std/multi_line.rs b/vendor/displaydoc/tests/std/multi_line.rs
new file mode 100644
index 000000000..cadb83e70
--- /dev/null
+++ b/vendor/displaydoc/tests/std/multi_line.rs
@@ -0,0 +1,37 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+#[derive(Display)]
+enum TestType {
+    /// This one is okay
+    Variant1,
+
+    /// Multi
+    /// line
+    /// doc.
+    Variant2,
+}
+
+static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/std/multi_line.stderr b/vendor/displaydoc/tests/std/multi_line.stderr
new file mode 100644
index 000000000..5e41e5428
--- /dev/null
+++ b/vendor/displaydoc/tests/std/multi_line.stderr
@@ -0,0 +1,19 @@
+error: proc-macro derive panicked
+  --> $DIR/multi_line.rs:23:10
+   |
+23 | #[derive(Display)]
+   |          ^^^^^^^
+   |
+   = help: message: Multi-line comments are disabled by default by displaydoc. Please consider using block doc comments (/** */) or adding the #[ignore_extra_doc_attributes] attribute to your type next to the derive.
+
+error[E0277]: `TestType` doesn't implement `std::fmt::Display`
+  --> $DIR/multi_line.rs:34:44
+   |
+34 | static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+   | -------------------------------------------^^^^^^^^----------------------
+   | |                                          |
+   | |                                          `TestType` cannot be formatted with the default formatter
+   | required by this bound in `assert_impl_all`
+   |
+   = help: the trait `std::fmt::Display` is not implemented for `TestType`
+   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
diff --git a/vendor/displaydoc/tests/std/multi_line_allow.rs b/vendor/displaydoc/tests/std/multi_line_allow.rs
new file mode 100644
index 000000000..05bdcf9fb
--- /dev/null
+++ b/vendor/displaydoc/tests/std/multi_line_allow.rs
@@ -0,0 +1,38 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+#[derive(Display)]
+#[ignore_extra_doc_attributes]
+enum TestType {
+    /// This one is okay
+    Variant1,
+
+    /// Multi
+    /// line
+    /// doc.
+    Variant2,
+}
+
+static_assertions::assert_impl_all!(label; TestType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/std/multiple.rs b/vendor/displaydoc/tests/std/multiple.rs
new file mode 100644
index 000000000..915f9abdd
--- /dev/null
+++ b/vendor/displaydoc/tests/std/multiple.rs
@@ -0,0 +1,38 @@
+#![feature(lang_items, start)]
+#![no_std]
+
+#[start]
+#[cfg(not(feature = "std"))]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+#[cfg(feature = "std")]
+fn main() {}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+#[derive(Display)]
+struct FakeType;
+
+static_assertions::assert_impl_all!(label; FakeType, core::fmt::Display);
+
+/// this type is pretty swell2
+#[derive(Display)]
+struct FakeType2;
+
+static_assertions::assert_impl_all!(label2; FakeType2, core::fmt::Display);
diff --git a/vendor/displaydoc/tests/std/without.rs b/vendor/displaydoc/tests/std/without.rs
new file mode 100644
index 000000000..32905aad9
--- /dev/null
+++ b/vendor/displaydoc/tests/std/without.rs
@@ -0,0 +1,28 @@
+#![cfg_attr(not(feature = "std"), feature(lang_items, start))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(not(feature = "std"), start)]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+#[lang = "eh_personality"]
+#[no_mangle]
+#[cfg(not(feature = "std"))]
+pub extern "C" fn rust_eh_personality() {}
+#[panic_handler]
+#[cfg(not(feature = "std"))]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use displaydoc::Display;
+
+/// this type is pretty swell
+struct FakeType;
+
+static_assertions::assert_impl_all!(label; FakeType, core::fmt::Display);
+
+#[cfg(feature = "std")]
+fn main() {}
diff --git a/vendor/displaydoc/tests/std/without.stderr b/vendor/displaydoc/tests/std/without.stderr
new file mode 100644
index 000000000..9780427e8
--- /dev/null
+++ b/vendor/displaydoc/tests/std/without.stderr
@@ -0,0 +1,19 @@
+warning: unused import: `displaydoc::Display`
+  --> $DIR/without.rs:20:5
+   |
+20 | use displaydoc::Display;
+   |     ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(unused_imports)]` on by default
+
+error[E0277]: `FakeType` doesn't implement `std::fmt::Display`
+  --> $DIR/without.rs:25:44
+   |
+25 | static_assertions::assert_impl_all!(label; FakeType, core::fmt::Display);
+   | -------------------------------------------^^^^^^^^----------------------
+   | |                                          |
+   | |                                          `FakeType` cannot be formatted with the default formatter
+   | required by this bound in `assert_impl_all`
+   |
+   = help: the trait `std::fmt::Display` is not implemented for `FakeType`
+   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead