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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/coherence/coherence-wasm-bindgen.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/coherence/coherence-wasm-bindgen.rs')
-rw-r--r-- | tests/ui/coherence/coherence-wasm-bindgen.rs | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/tests/ui/coherence/coherence-wasm-bindgen.rs b/tests/ui/coherence/coherence-wasm-bindgen.rs new file mode 100644 index 000000000..ee09a7244 --- /dev/null +++ b/tests/ui/coherence/coherence-wasm-bindgen.rs @@ -0,0 +1,37 @@ +// Capture a coherence pattern from wasm-bindgen that we discovered as part of +// future-compatibility warning #56105. This pattern currently receives a lint +// warning but we probably want to support it long term. +// +// Key distinction: we are implementing once for `A` (take ownership) and one +// for `&A` (borrow). +// +// c.f. #56105 + +#![deny(coherence_leak_check)] + +trait IntoWasmAbi { + fn some_method(&self) {} +} + +trait FromWasmAbi {} +trait RefFromWasmAbi {} +trait ReturnWasmAbi {} + +impl<'a, 'b, A, R> IntoWasmAbi for &'a (dyn Fn(A) -> R + 'b) +where + A: FromWasmAbi, + R: ReturnWasmAbi, +{ +} + +// Explicitly writing the bound lifetime. +impl<'a, 'b, A, R> IntoWasmAbi for &'a (dyn for<'x> Fn(&'x A) -> R + 'b) +where + A: RefFromWasmAbi, + R: ReturnWasmAbi, +{ + //~^^^^^ ERROR conflicting implementation + //~| WARNING this was previously accepted +} + +fn main() {} |