=== tests/cases/conformance/types/objectTypeLiteral/callSignatures/callSignaturesWithOptionalParameters.ts ===
// Optional parameters should be valid in all the below casts

function foo(x?: number) { }
>foo : (x?: number) => void
>x : number

var f = function foo(x?: number) { }
>f : (x?: number) => void
>function foo(x?: number) { } : (x?: number) => void
>foo : (x?: number) => void
>x : number

var f2 = (x: number, y?: number) => { }
>f2 : (x: number, y?: number) => void
>(x: number, y?: number) => { } : (x: number, y?: number) => void
>x : number
>y : number

foo(1);
>foo(1) : void
>foo : (x?: number) => void

foo();
>foo() : void
>foo : (x?: number) => void

f(1);
>f(1) : void
>f : (x?: number) => void

f();
>f() : void
>f : (x?: number) => void

f2(1);
>f2(1) : void
>f2 : (x: number, y?: number) => void

f2(1, 2);
>f2(1, 2) : void
>f2 : (x: number, y?: number) => void

class C {
>C : C

    foo(x?: number) { }
>foo : (x?: number) => void
>x : number
}

var c: C;
>c : C
>C : C

c.foo();
>c.foo() : void
>c.foo : (x?: number) => void
>c : C
>foo : (x?: number) => void

c.foo(1);
>c.foo(1) : void
>c.foo : (x?: number) => void
>c : C
>foo : (x?: number) => void

interface I {
>I : I

    (x?: number);
>x : number

    foo(x: number, y?: number);
>foo : (x: number, y?: number) => any
>x : number
>y : number
}

var i: I;
>i : I
>I : I

i();
>i() : any
>i : I

i(1);
>i(1) : any
>i : I

i.foo(1);
>i.foo(1) : any
>i.foo : (x: number, y?: number) => any
>i : I
>foo : (x: number, y?: number) => any

i.foo(1, 2);
>i.foo(1, 2) : any
>i.foo : (x: number, y?: number) => any
>i : I
>foo : (x: number, y?: number) => any

var a: {
>a : { (x?: number): any; foo(x?: number): any; }

    (x?: number);
>x : number

    foo(x?: number);
>foo : (x?: number) => any
>x : number
}

a();
>a() : any
>a : { (x?: number): any; foo(x?: number): any; }

a(1);
>a(1) : any
>a : { (x?: number): any; foo(x?: number): any; }

a.foo();
>a.foo() : any
>a.foo : (x?: number) => any
>a : { (x?: number): any; foo(x?: number): any; }
>foo : (x?: number) => any

a.foo(1);
>a.foo(1) : any
>a.foo : (x?: number) => any
>a : { (x?: number): any; foo(x?: number): any; }
>foo : (x?: number) => any

var b = {
>b : { foo(x?: number): void; a: (x: number, y?: number) => void; b: (x?: number) => void; }
>{    foo(x?: number) { },    a: function foo(x: number, y?: number) { },    b: (x?: number) => { }} : { foo(x?: number): void; a: (x: number, y?: number) => void; b: (x?: number) => void; }

    foo(x?: number) { },
>foo : (x?: number) => void
>x : number

    a: function foo(x: number, y?: number) { },
>a : (x: number, y?: number) => void
>function foo(x: number, y?: number) { } : (x: number, y?: number) => void
>foo : (x: number, y?: number) => void
>x : number
>y : number

    b: (x?: number) => { }
>b : (x?: number) => void
>(x?: number) => { } : (x?: number) => void
>x : number
}

b.foo();
>b.foo() : void
>b.foo : (x?: number) => void
>b : { foo(x?: number): void; a: (x: number, y?: number) => void; b: (x?: number) => void; }
>foo : (x?: number) => void

b.foo(1);
>b.foo(1) : void
>b.foo : (x?: number) => void
>b : { foo(x?: number): void; a: (x: number, y?: number) => void; b: (x?: number) => void; }
>foo : (x?: number) => void

b.a(1);
>b.a(1) : void
>b.a : (x: number, y?: number) => void
>b : { foo(x?: number): void; a: (x: number, y?: number) => void; b: (x?: number) => void; }
>a : (x: number, y?: number) => void

b.a(1, 2);
>b.a(1, 2) : void
>b.a : (x: number, y?: number) => void
>b : { foo(x?: number): void; a: (x: number, y?: number) => void; b: (x?: number) => void; }
>a : (x: number, y?: number) => void

b.b();
>b.b() : void
>b.b : (x?: number) => void
>b : { foo(x?: number): void; a: (x: number, y?: number) => void; b: (x?: number) => void; }
>b : (x?: number) => void

b.b(1);
>b.b(1) : void
>b.b : (x?: number) => void
>b : { foo(x?: number): void; a: (x: number, y?: number) => void; b: (x?: number) => void; }
>b : (x?: number) => void