=== tests/cases/compiler/overload2.ts ===
enum A { }
>A : A

enum B { }
>B : B
    
function foo(a: A);
>foo : { (a: A): any; (b: B): any; }
>a : A
>A : A

function foo(b: B);
>foo : { (a: A): any; (b: B): any; }
>b : B
>B : B

// should be ok
function foo(x: number) { 
>foo : { (a: A): any; (b: B): any; }
>x : number
}

class C { }
>C : C

function foo1(a: A);
>foo1 : { (a: A): any; (c: C): any; }
>a : A
>A : A

function foo1(c: C);
>foo1 : { (a: A): any; (c: C): any; }
>c : C
>C : C

// should be ok
function foo1(x: number) { 
>foo1 : { (a: A): any; (c: C): any; }
>x : number
}