=== tests/cases/compiler/interfaceClassMerging.ts ===
interface Foo {
>Foo : Foo

    method(a: number): string;
>method : (a: number) => string
>a : number

    optionalMethod?(a: number): string;
>optionalMethod : (a: number) => string
>a : number

    property: string;
>property : string

    optionalProperty?: string;
>optionalProperty : string
}

class Foo {
>Foo : Foo

    additionalProperty: string;
>additionalProperty : string

    additionalMethod(a: number): string {
>additionalMethod : (a: number) => string
>a : number

        return this.method(0);
>this.method(0) : string
>this.method : (a: number) => string
>this : this
>method : (a: number) => string
>0 : 0
    }
}

class Bar extends Foo {
>Bar : Bar
>Foo : Foo

    method(a: number) {
>method : (a: number) => string
>a : number

        return this.optionalProperty;
>this.optionalProperty : string
>this : this
>optionalProperty : string
    }
}


var bar = new Bar();
>bar : Bar
>new Bar() : Bar
>Bar : typeof Bar

bar.method(0);
>bar.method(0) : string
>bar.method : (a: number) => string
>bar : Bar
>method : (a: number) => string
>0 : 0

bar.optionalMethod(1);
>bar.optionalMethod(1) : string
>bar.optionalMethod : (a: number) => string
>bar : Bar
>optionalMethod : (a: number) => string
>1 : 1

bar.property;
>bar.property : string
>bar : Bar
>property : string

bar.optionalProperty;
>bar.optionalProperty : string
>bar : Bar
>optionalProperty : string

bar.additionalProperty;
>bar.additionalProperty : string
>bar : Bar
>additionalProperty : string

bar.additionalMethod(2);
>bar.additionalMethod(2) : string
>bar.additionalMethod : (a: number) => string
>bar : Bar
>additionalMethod : (a: number) => string
>2 : 2

var obj: {
>obj : { method(a: number): string; property: string; additionalProperty: string; additionalMethod(a: number): string; }

    method(a: number): string;
>method : (a: number) => string
>a : number

    property: string;
>property : string

    additionalProperty: string;
>additionalProperty : string

    additionalMethod(a: number): string;
>additionalMethod : (a: number) => string
>a : number

};

bar = obj;
>bar = obj : { method(a: number): string; property: string; additionalProperty: string; additionalMethod(a: number): string; }
>bar : Bar
>obj : { method(a: number): string; property: string; additionalProperty: string; additionalMethod(a: number): string; }

obj = bar;
>obj = bar : Bar
>obj : { method(a: number): string; property: string; additionalProperty: string; additionalMethod(a: number): string; }
>bar : Bar

