=== tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypingWithObjectMembersOptionality4.ts ===
// Base has required property, derived adds an optional property, no errors

interface Base { foo: string; }
>Base : Base, Symbol(Base, Decl(subtypingWithObjectMembersOptionality4.ts, 0, 0))
>foo : string, Symbol(foo, Decl(subtypingWithObjectMembersOptionality4.ts, 2, 16))

interface Derived extends Base { bar: string; }
>Derived : Derived, Symbol(Derived, Decl(subtypingWithObjectMembersOptionality4.ts, 2, 31))
>Base : Base, Symbol(Base, Decl(subtypingWithObjectMembersOptionality4.ts, 0, 0))
>bar : string, Symbol(bar, Decl(subtypingWithObjectMembersOptionality4.ts, 3, 32))

interface T {
>T : T, Symbol(T, Decl(subtypingWithObjectMembersOptionality4.ts, 3, 47))

    Foo: Base;
>Foo : Base, Symbol(Foo, Decl(subtypingWithObjectMembersOptionality4.ts, 5, 13))
>Base : Base, Symbol(Base, Decl(subtypingWithObjectMembersOptionality4.ts, 0, 0))
}

interface S extends T {
>S : S, Symbol(S, Decl(subtypingWithObjectMembersOptionality4.ts, 7, 1))
>T : T, Symbol(T, Decl(subtypingWithObjectMembersOptionality4.ts, 3, 47))

    Foo2?: Derived // ok
>Foo2 : Derived, Symbol(Foo2, Decl(subtypingWithObjectMembersOptionality4.ts, 9, 23))
>Derived : Derived, Symbol(Derived, Decl(subtypingWithObjectMembersOptionality4.ts, 2, 31))
}

interface T2 {
>T2 : T2, Symbol(T2, Decl(subtypingWithObjectMembersOptionality4.ts, 11, 1))

    1: Base; 
>Base : Base, Symbol(Base, Decl(subtypingWithObjectMembersOptionality4.ts, 0, 0))
}

interface S2 extends T2 {
>S2 : S2, Symbol(S2, Decl(subtypingWithObjectMembersOptionality4.ts, 15, 1))
>T2 : T2, Symbol(T2, Decl(subtypingWithObjectMembersOptionality4.ts, 11, 1))

    2?: Derived; // ok
>Derived : Derived, Symbol(Derived, Decl(subtypingWithObjectMembersOptionality4.ts, 2, 31))
}

interface T3 {
>T3 : T3, Symbol(T3, Decl(subtypingWithObjectMembersOptionality4.ts, 19, 1))

    '1': Base;
>Base : Base, Symbol(Base, Decl(subtypingWithObjectMembersOptionality4.ts, 0, 0))
}

interface S3 extends T3 {
>S3 : S3, Symbol(S3, Decl(subtypingWithObjectMembersOptionality4.ts, 23, 1))
>T3 : T3, Symbol(T3, Decl(subtypingWithObjectMembersOptionality4.ts, 19, 1))

    '1.0'?: Derived; // ok
>Derived : Derived, Symbol(Derived, Decl(subtypingWithObjectMembersOptionality4.ts, 2, 31))
}

// object literal case
var a: { Foo: Base; }
>a : { Foo: Base; }, Symbol(a, Decl(subtypingWithObjectMembersOptionality4.ts, 30, 3))
>Foo : Base, Symbol(Foo, Decl(subtypingWithObjectMembersOptionality4.ts, 30, 8))
>Base : Base, Symbol(Base, Decl(subtypingWithObjectMembersOptionality4.ts, 0, 0))

var b: { Foo2?: Derived; }
>b : { Foo2?: Derived; }, Symbol(b, Decl(subtypingWithObjectMembersOptionality4.ts, 31, 3))
>Foo2 : Derived, Symbol(Foo2, Decl(subtypingWithObjectMembersOptionality4.ts, 31, 8))
>Derived : Derived, Symbol(Derived, Decl(subtypingWithObjectMembersOptionality4.ts, 2, 31))

var r = true ? a : b; // ok
>r : { Foo: Base; } | { Foo2?: Derived; }, Symbol(r, Decl(subtypingWithObjectMembersOptionality4.ts, 32, 3))
>true ? a : b : { Foo: Base; } | { Foo2?: Derived; }
>true : boolean
>a : { Foo: Base; }, Symbol(a, Decl(subtypingWithObjectMembersOptionality4.ts, 30, 3))
>b : { Foo2?: Derived; }, Symbol(b, Decl(subtypingWithObjectMembersOptionality4.ts, 31, 3))