tests/cases/compiler/implicitAnyFunctionReturnNullOrUndefined.ts(2,1): error TS7010: 'nullWidenFunction', which lacks return-type annotation, implicitly has an 'any' return type.
tests/cases/compiler/implicitAnyFunctionReturnNullOrUndefined.ts(3,1): error TS7010: 'undefinedWidenFunction', which lacks return-type annotation, implicitly has an 'any' return type.
tests/cases/compiler/implicitAnyFunctionReturnNullOrUndefined.ts(6,5): error TS7010: 'nullWidenFuncOfC', which lacks return-type annotation, implicitly has an 'any' return type.
tests/cases/compiler/implicitAnyFunctionReturnNullOrUndefined.ts(10,5): error TS7010: 'underfinedWidenFuncOfC', which lacks return-type annotation, implicitly has an 'any' return type.