v8/test/mjsunit/regress/regress-crbug-350864.js

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// Flags: --harmony_symbols --harmony-weak-collections

var v0 = new WeakMap;
var v1 = {};
v0.set(v1, 1);
var sym = Symbol();
v1[sym] = 1;
var symbols = Object.getOwnPropertySymbols(v1);
assertArrayEquals([sym], symbols);