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function f() {
var a = [];
for (var i = 0; i < 1000; i++) {
a.x = {}
}
a[i][0] = 0;
}
var e;
try {
f();
} catch (error) {e = error;}
assertEq(e.constructor.name, "TypeError");
assertEq(e.message.includes("a[i] is undefined"), true);