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=== tests/cases/compiler/covariance1.ts ===
module M {
>M : Symbol(M, Decl(covariance1.ts, 0, 0))
interface X { m1:number; }
>X : Symbol(X, Decl(covariance1.ts, 0, 10))
>m1 : Symbol(X.m1, Decl(covariance1.ts, 2, 17))
export class XX implements X { constructor(public m1:number) { } }
>XX : Symbol(XX, Decl(covariance1.ts, 2, 30))
>X : Symbol(X, Decl(covariance1.ts, 0, 10))
>m1 : Symbol(XX.m1, Decl(covariance1.ts, 3, 47))
interface Y { x:X; }
>Y : Symbol(Y, Decl(covariance1.ts, 3, 70))
>x : Symbol(Y.x, Decl(covariance1.ts, 5, 17))
>X : Symbol(X, Decl(covariance1.ts, 0, 10))
export function f(y:Y) { }
>f : Symbol(f, Decl(covariance1.ts, 5, 24))
>y : Symbol(y, Decl(covariance1.ts, 7, 22))
>Y : Symbol(Y, Decl(covariance1.ts, 3, 70))
var a:X;
>a : Symbol(a, Decl(covariance1.ts, 9, 7))
>X : Symbol(X, Decl(covariance1.ts, 0, 10))
f({x:a}); // ok
>f : Symbol(f, Decl(covariance1.ts, 5, 24))
>x : Symbol(x, Decl(covariance1.ts, 10, 7))
>a : Symbol(a, Decl(covariance1.ts, 9, 7))
var b:XX;
>b : Symbol(b, Decl(covariance1.ts, 12, 7))
>XX : Symbol(XX, Decl(covariance1.ts, 2, 30))
f({x:b}); // ok covariant subtype
>f : Symbol(f, Decl(covariance1.ts, 5, 24))
>x : Symbol(x, Decl(covariance1.ts, 13, 7))
>b : Symbol(b, Decl(covariance1.ts, 12, 7))
}
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