=== tests/cases/compiler/numericIndexerConstraint3.ts ===
class A {
>A : A

    foo: number;
>foo : number
}

class B extends A {
>B : B
>A : A

    bar: string;
>bar : string
}

class C {
>C : C

    0: B;
>B : B

    [x: number]: A;
>x : number
>A : A
}