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Guillaume Gomez
90cd3d3a96
Improve `&pin` reference-pattern suggestions This fills in the `pin_ergonomics` FIXME in `borrow_pat_suggestion` by making the diagnostic prefix account for both `Pinnedness` and `Mutability`. Previously, the type-position suggestion path used ordinary reference spelling, which can spell `&` and `&mut` but cannot correctly spell pinned reference-pattern suggestions such as `&pin const` and `&pin mut`. This is a diagnostic-only change. It adds focused UI coverage for both pinned const and pinned mut reference-pattern suggestions.