=== tests/cases/compiler/optionalParamInOverride.ts ===
class Z {
>Z : Symbol(Z, Decl(optionalParamInOverride.ts, 0, 0))

    public func(): void { }
>func : Symbol(Z.func, Decl(optionalParamInOverride.ts, 0, 9))
}
class Y extends Z {
>Y : Symbol(Y, Decl(optionalParamInOverride.ts, 2, 1))
>Z : Symbol(Z, Decl(optionalParamInOverride.ts, 0, 0))

    public func(value?: any): void { }
>func : Symbol(Y.func, Decl(optionalParamInOverride.ts, 3, 19))
>value : Symbol(value, Decl(optionalParamInOverride.ts, 4, 16))
}