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when there are 3 or more return statements in the loop emit the first 3 errors and duplicated diagnostic information modified: compiler/rustc_typeck/src/check/coercion.rs new file: src/test/ui/typeck/issue-100285.rs new file: src/test/ui/typeck/issue-100285.stderr
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.