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Suggest `impl Trait` return type when incorrectly using a generic return type Address #85991 When there is a type mismatch error and the return type is generic, and that generic parameter is not used in the function parameters, suggest replacing that generic with the `impl Trait` syntax. r? `@estebank`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.