==== tests/cases/compiler/functionCall8.ts (2 errors) ====
    function foo(a?:string){}
    foo('foo'); 
    foo('foo', 'bar'); 
    ~~~~~~~~~~~~~~~~~
!!! Supplied parameters do not match any signature of call target.
    foo(4);
        ~
!!! Argument of type 'number' is not assignable to parameter of type 'string'.
    foo();