17 lines
278 B
TypeScript
17 lines
278 B
TypeScript
module M {
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interface X { m1:number; }
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export class XX implements X { constructor(public m1:number) { } }
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interface Y { x:X; }
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export function f(y:Y) { }
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var a:X;
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f({x:a}); // ok
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var b:XX;
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f({x:b}); // ok covariant subtype
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}
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