99fc56b9de
Fix bad suggestions for code from proc_macro Fixes #85932 This disables these suggestions for spans from external macros, while keeping them for macros defined locally: Before: ``` 3 | #[hello] | ^^^^^^^^ | | | expected `&mut i32`, found integer | help: consider mutably borrowing here: `&mut #[hello]` ``` After: ``` 3 | #[hello] | ^^^^^^^^ expected `&mut i32`, found integer ``` Unchanged: ``` 26 | macro_rules! bla { () => { x(123); } } | ^^^ | | | expected `&mut i32`, found integer | help: consider mutably borrowing here: `&mut 123` ... 29 | bla!(); | ------- in this macro invocation ``` |
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For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.