=== tests/cases/compiler/functionCall11.ts ===
function foo(a:string, b?:number){} 
>foo : Symbol(foo, Decl(functionCall11.ts, 0, 0))
>a : Symbol(a, Decl(functionCall11.ts, 0, 13))
>b : Symbol(b, Decl(functionCall11.ts, 0, 22))

foo('foo', 1); 
>foo : Symbol(foo, Decl(functionCall11.ts, 0, 0))

foo('foo'); 
>foo : Symbol(foo, Decl(functionCall11.ts, 0, 0))

foo();
>foo : Symbol(foo, Decl(functionCall11.ts, 0, 0))

foo(1, 'bar');
>foo : Symbol(foo, Decl(functionCall11.ts, 0, 0))

foo('foo', 1, 'bar');
>foo : Symbol(foo, Decl(functionCall11.ts, 0, 0))

