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Fixing bad suggestion for `_` in `const` type when a function #81885 Closes #81885 ``` error[E0121]: the type placeholder `_` is not allowed within types on item signatures --> $DIR/typeck_type_placeholder_item_help.rs:13:22 | LL | const TEST4: fn() -> _ = 42; | ^ | | | not allowed in type signatures | help: use type parameters instead: `T` ``` Do not show the suggestion `help: use type parameters instead: T` when `fn`