test/mjsunit/regress/regress-356589.js

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// Flags: --harmony-object-observe

// This test passes if it does not crash in debug mode

arr = ['a', 'b', 'c', 'd'];
Object.defineProperty(arr.__proto__, '0', { get: function(){} });
Object.defineProperty(arr, '2', {get: function(){} });
Object.observe(arr, function() {});
arr.length = 2;