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Improve error message for missing trait in trait impl Fixes #88818. For the following example: ```rust struct S { } impl for S { } ``` the current output is: ``` error: missing trait in a trait impl --> t1.rs:2:5 | 2 | impl for S { } | ^ ``` With my changes, I get: ``` error: missing trait in a trait impl --> t1.rs:2:5 | 2 | impl for S { } | ^ | help: add a trait here | 2 | impl Trait for S { } | +++++ help: for an inherent impl, drop this `for` | 2 - impl for S { } 2 + impl S { } | ```