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function foo(x, j, n) {
var a = 0;
for (var i = 0; i < n; i++)
a += x[j];
return a;
}
var a = foo([1,2,3,4], 3, 100);
assertEq(a, 400);
var b = foo([1,2,3,4], 5, 100);
assertEq(b, NaN);