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// @lib: es2015
// @strictNullChecks: true
const a: { x?: number; y?: number } = { };
let x: number;
// Should not error out
({ x = 0 } = a);
({ x: x = 0} = a);
({ y: x = 0} = a);
// Should be error
({ x = undefined } = a);
({ x: x = undefined } = a);
({ y: x = undefined } = a);
const { x: z1 } = a;
const { x: z2 = 0 } = a;
const { x: z3 = undefined } = a;
declare const r: Iterator<number>;
let done: boolean;
let value;
({ done = false, value } = r.next());
({ done: done = false, value } = r.next());
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