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function f(a, b) { return a + " " + b; }
for (var i = 0; i < 10; ++i) {
var s = '';
var a = {toString: function () { s += 'a'; return 'a'; }};
var b = {toString: function () { s += 'b'; return 'b'; }};
f(a, b);
assertEq(s, 'ab');
}