File: typeArgumentInferenceWithConstraintAsCommonRoot.ts

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node-typescript 3.3.3333-1
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interface Animal { x }
interface Giraffe extends Animal { y }
interface Elephant extends Animal { z }
function f<T extends Animal>(x: T, y: T): T { return undefined; }
var g: Giraffe;
var e: Elephant;
f(g, e); // valid because both Giraffe and Elephant satisfy the constraint. T is Animal