tests/cases/conformance/parser/ecmascript5/ParameterLists/parserParameterList16.ts(2,4): error TS2394: Overload signature is not compatible with function implementation. tests/cases/conformance/parser/ecmascript5/ParameterLists/parserParameterList16.ts(2,8): error TS2371: A parameter initializer is only allowed in a function or constructor implementation. ==== tests/cases/conformance/parser/ecmascript5/ParameterLists/parserParameterList16.ts (2 errors) ==== class C { foo(a = 4); ~~~~~~~~~~~ !!! error TS2394: Overload signature is not compatible with function implementation. ~~~~~ !!! error TS2371: A parameter initializer is only allowed in a function or constructor implementation. foo(a, b) { } }