// merged interfaces behave as if all extends clauses from each declaration are merged together // no errors expected class C { a: number; } class C2 { b: number; } class C3 { c: string; } class C4 { d: string; } interface A extends C, C3 { y: string; } interface A extends C2, C4 { z: string; } class D implements A { a: number; b: number; c: string; d: string; y: string; z: string; } var a: A; var r = a.a; // generic interfaces in a module module M { class C { a: T; } class C2 { b: T; } class C3 { c: T; } class C4 { d: T; } interface A extends C, C3 { y: T; } interface A extends C2, C4 { z: T; } class D implements A { a: boolean; b: string; c: boolean; d: string; y: boolean; z: boolean; } }