==== tests/cases/compiler/functionCall11.ts (3 errors) ====
    function foo(a:string, b?:number){} 
    foo('foo', 1); 
    foo('foo'); 
    foo();
    ~~~~~
!!! Supplied parameters do not match any signature of call target.
    foo(1, 'bar');
        ~
!!! Argument of type 'number' is not assignable to parameter of type 'string'.
    foo('foo', 1, 'bar');
    ~~~~~~~~~~~~~~~~~~~~
!!! Supplied parameters do not match any signature of call target.