michael@0: // setVariable can change the types of variables and arguments in functions.
michael@0: 
michael@0: var g = newGlobal();
michael@0: g.eval("function f(a) { var b = a + 1; debugger; return a + b; }");
michael@0: for (var i = 0; i < 20; i++)
michael@0:     assertEq(g.f(i), 2 * i + 1);
michael@0: 
michael@0: var dbg = new Debugger(g);
michael@0: dbg.onDebuggerStatement = function (frame) {
michael@0:     frame.environment.setVariable("a", "xyz");
michael@0:     frame.environment.setVariable("b", "zy");
michael@0: };
michael@0: for (var i = 0; i < 10; i++)
michael@0:     assertEq(g.f(i), "xyzzy");