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function f(idx) {
"use strict";
let z = [0, 1, 2, 3, 4, 5, 6, 7, 8, , , ];
Object.freeze(z);
try {
z[idx] = 0;
} catch (e) {
return e.message;
}
}
assertEq(f(4), "4 is read-only");
assertEq(f(-1), 'can\'t define property "-1": Array is not extensible');
assertEq(f(9), "can't define property 9: Array is not extensible");
assertEq(f(0xffffffff), 'can\'t define property "4294967295": Array is not extensible');