=== tests/cases/conformance/interfaces/interfaceDeclarations/interfaceWithCallSignaturesThatHidesBaseSignature2.ts ===
interface Foo {
>Foo : Foo

    (): { a: number; b: number };
>a : number
>b : number
}

interface Derived extends Foo { // error
>Derived : Derived
>Foo : Foo

    (): { a: number };
>a : number
}

var d: Derived;
>d : Derived
>Derived : Derived

var r = d();
>r : { a: number; }
>d() : { a: number; }
>d : Derived