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=== tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity2.ts ===
// subclassing is not transitive when you can remove required parameters and add optional parameters
class C {
>C : C
foo(x: number, y: number) { }
>foo : (x: number, y: number) => void
>x : number
>y : number
}
class D extends C {
>D : D
>C : C
foo(x: number) { } // ok to drop parameters
>foo : (x: number) => void
>x : number
}
class E extends D {
>E : E
>D : D
foo(x: number, y?: string) { } // ok to add optional parameters
>foo : (x: number, y?: string) => void
>x : number
>y : string
}
var c: C;
>c : C
var d: D;
>d : D
var e: E;
>e : E
c = e;
>c = e : E
>c : C
>e : E
var r = c.foo(1, 1);
>r : void
>c.foo(1, 1) : void
>c.foo : (x: number, y: number) => void
>c : C
>foo : (x: number, y: number) => void
>1 : 1
>1 : 1
var r2 = e.foo(1, '');
>r2 : void
>e.foo(1, '') : void
>e.foo : (x: number, y?: string) => void
>e : E
>foo : (x: number, y?: string) => void
>1 : 1
>'' : ""
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