michael@0: 
michael@0: /* Test concat compiler paths. */
michael@0: 
michael@0: for (var i = 9; i < 10; i++)
michael@0:   assertEq([2].concat([3])[0], 2);
michael@0: 
michael@0: function f(a, b) {
michael@0:   return a.concat(b)[0];
michael@0: }
michael@0: function g() {
michael@0:   var x = [];
michael@0:   var y = [1];
michael@0:   for (var i = 0; i < 50; i++)
michael@0:     assertEq(f(x, y), 1);
michael@0:   eval('y[0] = "three"');
michael@0:   assertEq(f(x, y), "three");
michael@0: }
michael@0: g();