File: typeArgInference2.ts

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node-typescript 2.1.5-1
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interface Item {
    name: string;
}

declare function foo<T extends Item>(x?: T, y?: T): T;

var z1 = foo(null);                   // any
var z2 = foo();                       // Item
var z3 = foo({ name: null });         // { name: any }
var z4 = foo({ name: "abc" });        // { name: string }
var z5 = foo({ name: "abc", a: 5 });  // { name: string; a: number }
var z6 = foo({ name: "abc", a: 5 }, { name: "def", b: 5 });  // error