File: covariance1.types

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=== tests/cases/compiler/covariance1.ts ===
module M {
>M : typeof M

    interface X { m1:number; }
>m1 : number

    export class XX implements X { constructor(public m1:number) { } }
>XX : XX
>m1 : number

    interface Y { x:X; }
>x : X

    export function f(y:Y) { }
>f : (y: Y) => void
>y : Y

    var a:X;
>a : X

    f({x:a}); // ok
>f({x:a}) : void
>f : (y: Y) => void
>{x:a} : { x: X; }
>x : X
>a : X

    var b:XX;
>b : XX

    f({x:b}); // ok covariant subtype
>f({x:b}) : void
>f : (y: Y) => void
>{x:b} : { x: XX; }
>x : XX
>b : XX
}