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Show more information when multiple `impl`s apply - When there are `impl`s without type params, show only those (to avoid showing overly generic `impl`s). ``` error[E0283]: type annotations needed --> $DIR/multiple-impl-apply.rs:34:9 | LL | let y = x.into(); | ^ ---- type must be known at this point | note: multiple `impl`s satisfying `_: From<Baz>` found --> $DIR/multiple-impl-apply.rs:14:1 | LL | impl From<Baz> for Bar { | ^^^^^^^^^^^^^^^^^^^^^^ ... LL | impl From<Baz> for Foo { | ^^^^^^^^^^^^^^^^^^^^^^ = note: required for `Baz` to implement `Into<_>` help: consider giving `y` an explicit type | LL | let y: /* Type */ = x.into(); | ++++++++++++ ``` - Lower the importance of `T: Sized`, `T: WellFormed` and coercion errors, to prioritize more relevant errors. The pre-existing deduplication logic deals with hiding redundant errors better that way, and we show errors with more metadata that is useful to the user. - Show `<SelfTy as Trait>::assoc_fn` suggestion in more cases. ``` error[E0790]: cannot call associated function on trait without specifying the corresponding `impl` type --> $DIR/cross-return-site-inference.rs:38:16 | LL | return Err(From::from("foo")); | ^^^^^^^^^^ cannot call associated function of trait | help: use a fully-qualified path to a specific available implementation | LL | return Err(</* self type */ as From>::from("foo")); | +++++++++++++++++++ + ``` Fix #88284. |
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