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

    constructor() {
        this['__proto__'] = null; // used to cause ICE
>this : Symbol(X, Decl(protoInIndexer.ts, 0, 0))
    }
}