bc33dd7ac4
Currently, a coherence error based on overlapping impls simply mentions the trait, and points to the two conflicting impls: ``` error: conflicting implementations for trait `Foo` ``` With this commit, the error will include all input types to the trait (including the `Self` type) after unification between the overlapping impls. In other words, the error message will provide feedback with full type details, like: ``` error: conflicting implementations of trait `Foo<u32>` for type `u8`: ``` When the `Self` type for the two impls unify to an inference variable, it is elided in the output, since "for type `_`" is just noise in that case. Closes #23980
43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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trait Foo {}
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impl<T> Foo for T {} //~ ERROR conflicting implementations of trait `Foo`:
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impl<U> Foo for U {}
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trait Bar {}
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impl<T> Bar for T {} //~ ERROR conflicting implementations of trait `Bar` for type `u8`:
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impl Bar for u8 {}
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trait Baz<T> {}
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impl<T, U> Baz<U> for T {} //~ ERROR conflicting implementations of trait `Baz<_>` for type `u8`:
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impl<T> Baz<T> for u8 {}
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trait Quux<T> {}
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impl<T, U> Quux<U> for T {} //~ ERROR conflicting implementations of trait `Quux<_>`:
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impl<T> Quux<T> for T {}
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trait Qaar<T> {}
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impl<T, U> Qaar<U> for T {} //~ ERROR conflicting implementations of trait `Qaar<u8>`:
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impl<T> Qaar<u8> for T {}
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trait Qaax<T> {}
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impl<T, U> Qaax<U> for T {}
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//~^ ERROR conflicting implementations of trait `Qaax<u8>` for type `u32`:
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impl Qaax<u8> for u32 {}
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fn main() {}
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