michael@0: (function() {
michael@0:     var o = {'arguments': 42};
michael@0:     with (o) { // Definitely forces heavyweight.
michael@0:         // Note syntax is not a property access.
michael@0:         reportCompare(delete arguments, true,
michael@0:                       "arguments property deletion within with block");
michael@0:     }
michael@0:     reportCompare('arguments' in o, false,
michael@0:                   "property deletion observable");
michael@0: })();
michael@0: 
michael@0: (function() {
michael@0:     var o = {'arguments': 42};
michael@0:     delete o.arguments;
michael@0:     reportCompare('arguments' in o, false,
michael@0:                   "arguments property deletion with property access syntax");
michael@0: })();
michael@0: 
michael@0: (function() {
michael@0:     var arguments = 42; // Forces heavyweight.
michael@0:     reportCompare(delete arguments, false,
michael@0:                   "arguments variable");
michael@0: })();
michael@0: 
michael@0: (function() {
michael@0:     reportCompare(delete arguments, false, "arguments object");
michael@0: })();