=== tests/cases/compiler/first.ts ===
declare function mix<TMix>(mixin: TMix): TMix;
>mix : Symbol(mix, Decl(first.ts, 0, 0))
>TMix : Symbol(TMix, Decl(first.ts, 0, 21))
>mixin : Symbol(mixin, Decl(first.ts, 0, 27))
>TMix : Symbol(TMix, Decl(first.ts, 0, 21))
>TMix : Symbol(TMix, Decl(first.ts, 0, 21))

const DisposableMixin = class {
>DisposableMixin : Symbol(DisposableMixin, Decl(first.ts, 2, 5))

    protected _onDispose() {
>_onDispose : Symbol(DisposableMixin._onDispose, Decl(first.ts, 2, 31))

        this._assertIsStripped()
>this._assertIsStripped : Symbol(DisposableMixin._assertIsStripped, Decl(first.ts, 5, 5))
>this : Symbol(DisposableMixin, Decl(first.ts, 2, 23))
>_assertIsStripped : Symbol(DisposableMixin._assertIsStripped, Decl(first.ts, 5, 5))
    }
    private _assertIsStripped() {
>_assertIsStripped : Symbol(DisposableMixin._assertIsStripped, Decl(first.ts, 5, 5))
    }
};

// No error, but definition is wrong. 
export default mix(DisposableMixin);
>mix : Symbol(mix, Decl(first.ts, 0, 0))
>DisposableMixin : Symbol(DisposableMixin, Decl(first.ts, 2, 5))

export class Monitor extends mix(DisposableMixin) {
>Monitor : Symbol(Monitor, Decl(first.ts, 11, 36))
>mix : Symbol(mix, Decl(first.ts, 0, 0))
>DisposableMixin : Symbol(DisposableMixin, Decl(first.ts, 2, 5))

    protected _onDispose() {
>_onDispose : Symbol(Monitor._onDispose, Decl(first.ts, 12, 51))
    }
}

=== tests/cases/compiler/another.ts ===
declare function mix<TMix>(mixin: TMix): TMix;
>mix : Symbol(mix, Decl(another.ts, 0, 0))
>TMix : Symbol(TMix, Decl(another.ts, 0, 21))
>mixin : Symbol(mixin, Decl(another.ts, 0, 27))
>TMix : Symbol(TMix, Decl(another.ts, 0, 21))
>TMix : Symbol(TMix, Decl(another.ts, 0, 21))

const DisposableMixin = class {
>DisposableMixin : Symbol(DisposableMixin, Decl(another.ts, 2, 5))

    protected _onDispose() {
>_onDispose : Symbol(DisposableMixin._onDispose, Decl(another.ts, 2, 31))

        this._assertIsStripped()
>this._assertIsStripped : Symbol(DisposableMixin._assertIsStripped, Decl(another.ts, 5, 5))
>this : Symbol(DisposableMixin, Decl(another.ts, 2, 23))
>_assertIsStripped : Symbol(DisposableMixin._assertIsStripped, Decl(another.ts, 5, 5))
    }
    private _assertIsStripped() {
>_assertIsStripped : Symbol(DisposableMixin._assertIsStripped, Decl(another.ts, 5, 5))
    }
};

export default class extends mix(DisposableMixin) {
>mix : Symbol(mix, Decl(another.ts, 0, 0))
>DisposableMixin : Symbol(DisposableMixin, Decl(another.ts, 2, 5))

    protected _onDispose() {
>_onDispose : Symbol(default._onDispose, Decl(another.ts, 10, 51))
    }
}