=== tests/cases/compiler/functionOverloads7.ts ===
class foo { 
>foo : foo

   private bar();
>bar : { (): any; (foo: string): any; }

   private bar(foo: string);
>bar : { (): any; (foo: string): any; }
>foo : string

   private bar(foo?: any){ return "foo" }
>bar : { (): any; (foo: string): any; }
>foo : any
>"foo" : string

   public n() {
>n : () => void

     var foo = this.bar();
>foo : any
>this.bar() : any
>this.bar : { (): any; (foo: string): any; }
>this : foo
>bar : { (): any; (foo: string): any; }

     foo = this.bar("test");
>foo = this.bar("test") : any
>foo : any
>this.bar("test") : any
>this.bar : { (): any; (foo: string): any; }
>this : foo
>bar : { (): any; (foo: string): any; }
>"test" : string
   }
}