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c86e13f330
Parser: Suggest Placing the Return Type After Function Parameters
Fixes #126311
This PR suggests placing the return type after the function parameters when it's misplaced after a `where` clause.
This also tangentially improves diagnostics for cases like [this](86d6f1312a/tests/ui/parser/issues/misplaced-return-type-without-where-issue-126311.rs (L1C1-L1C28)) and adds doc comments for `parser::AllowPlus`.