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function f() {
var x = undefined;
try {
[1, 2, 3].map(x);
assertEq(0, 1);
} catch(e) {
assertEq(e.toString().includes("x is not"), true);
}
try {
[1, 2, 3].filter(x, 1, 2);
assertEq(0, 1);
} catch(e) {
assertEq(e.toString().includes("x is not"), true);
}
}
f();