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Auto merge of rust-lang#119849 - lcnr:eagerly-instantiate-binders, r=…
…compiler-errors more eagerly instantiate binders The old solver sometimes incorrectly used `sub`, change it to explicitly instantiate binders and use `eq` instead. While doing so I also moved the instantiation before the normalize calls. This caused some observable changes, will explain these inline. This PR therefore requires a crater run and an FCP. r? types
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| //@ check-pass | ||
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| // We try to prove `T::Rigid: Into<?0>` and have 2 candidates from where-clauses: | ||
| // | ||
| // - `Into<String>` | ||
| // - `Into<<T::Rigid as Elaborate>::Assoc>` | ||
| // | ||
| // This causes ambiguity unless we normalize the alias in the second candidate | ||
| // to detect that they actually result in the same constraints. | ||
| trait Trait { | ||
| type Rigid: Elaborate<Assoc = String> + Into<String>; | ||
| } | ||
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| trait Elaborate: Into<Self::Assoc> { | ||
| type Assoc; | ||
| } | ||
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| fn impls<T: Into<U>, U>(_: T) {} | ||
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| fn test<P: Trait>(rigid: P::Rigid) { | ||
| impls(rigid); | ||
| } | ||
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| fn main() {} |
27 changes: 27 additions & 0 deletions
27
tests/ui/associated-type-bounds/dedup-normalized-2-higher-ranked.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| // We try to prove `for<'b> T::Rigid: Bound<'b, ?0>` and have 2 candidates from where-clauses: | ||
| // | ||
| // - `for<'a> Bound<'a, String>` | ||
| // - `for<'a> Bound<'a, <T::Rigid as Elaborate>::Assoc>` | ||
| // | ||
| // This causes ambiguity unless we normalize the alias in the second candidate | ||
| // to detect that they actually result in the same constraints. We currently | ||
| // fail to detect that the constraints from these bounds are equal and error | ||
| // with ambiguity. | ||
| trait Bound<'a, U> {} | ||
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| trait Trait { | ||
| type Rigid: Elaborate<Assoc = String> + for<'a> Bound<'a, String>; | ||
| } | ||
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| trait Elaborate: for<'a> Bound<'a, Self::Assoc> { | ||
| type Assoc; | ||
| } | ||
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| fn impls<T: for<'b> Bound<'b, U>, U>(_: T) {} | ||
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| fn test<P: Trait>(rigid: P::Rigid) { | ||
| impls(rigid); | ||
| //~^ ERROR type annotations needed | ||
| } | ||
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| fn main() {} |
20 changes: 20 additions & 0 deletions
20
tests/ui/associated-type-bounds/dedup-normalized-2-higher-ranked.stderr
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| error[E0283]: type annotations needed | ||
| --> $DIR/dedup-normalized-2-higher-ranked.rs:23:5 | ||
| | | ||
| LL | impls(rigid); | ||
| | ^^^^^ cannot infer type of the type parameter `U` declared on the function `impls` | ||
| | | ||
| = note: cannot satisfy `for<'b> <P as Trait>::Rigid: Bound<'b, _>` | ||
| note: required by a bound in `impls` | ||
| --> $DIR/dedup-normalized-2-higher-ranked.rs:20:13 | ||
| | | ||
| LL | fn impls<T: for<'b> Bound<'b, U>, U>(_: T) {} | ||
| | ^^^^^^^^^^^^^^^^^^^^ required by this bound in `impls` | ||
| help: consider specifying the generic arguments | ||
| | | ||
| LL | impls::<<P as Trait>::Rigid, U>(rigid); | ||
| | ++++++++++++++++++++++++++ | ||
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| error: aborting due to 1 previous error | ||
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| For more information about this error, try `rustc --explain E0283`. |
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