=== tests/cases/compiler/inheritanceMemberFuncOverridingMethod.ts ===
class a {
>a : a

    x() {
>x : () => string

        return "10";
>"10" : string
    }
}

class b extends a {
>b : b
>a : a

    x() {
>x : () => string

        return "20";
>"20" : string
    }
}