38 lines
880 B
Rust
38 lines
880 B
Rust
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// Capture a coherence pattern from wasm-bindgen that we discovered as part of
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// future-compatibility warning #56105. This pattern currently receives a lint
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// warning but we probably want to support it long term.
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//
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// Key distinction: we are implementing once for `A` (take ownership) and one
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// for `&A` (borrow).
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//
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// c.f. #56105
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#![deny(coherence_leak_check)]
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trait IntoWasmAbi {
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fn some_method(&self) {}
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}
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trait FromWasmAbi {}
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trait RefFromWasmAbi {}
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trait ReturnWasmAbi {}
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impl<'a, 'b, A, R> IntoWasmAbi for &'a (dyn Fn(A) -> R + 'b)
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where
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A: FromWasmAbi,
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R: ReturnWasmAbi,
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{
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}
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// Explicitly writing the bound lifetime.
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impl<'a, 'b, A, R> IntoWasmAbi for &'a (dyn for<'x> Fn(&'x A) -> R + 'b)
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where
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A: RefFromWasmAbi,
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R: ReturnWasmAbi,
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{
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//~^^^^^ ERROR conflicting implementation
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//~| WARNING this was previously accepted
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}
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fn main() {}
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