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68939f7826
Suggest using type args directly instead of equality constraint When type arguments are written erroneously using an equality constraint we suggest specifying them directly without the equality constraint. Fixes #122162 Changes the diagnostic in the issue from: ```rust error[E0229]: associated type bindings are not allowed here 9 | impl std::cmp::PartialEq<Rhs = T> for S { | ^^^^^^^ associated type not allowed here | ``` to ```rust error[E0229]: associated type bindings are not allowed here 9 | impl std::cmp::PartialEq<Rhs = T> for S { | ^^^^^^^ associated type not allowed here | help: to use `T` as a generic argument specify it directly | | impl std::cmp::PartialEq<T> for S { | ~ ```
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.