==== tests/cases/conformance/parser/ecmascript5/ParameterLists/parserParameterList15.ts (2 errors) ====
    function foo(a = 4);
    ~~~~~~~~~~~~~~~~~~~~
!!! Overload signature is not compatible with function implementation.
                 ~~~~~
!!! A parameter initializer is only allowed in a function or constructor implementation.
    function foo(a, b) {}