michael@0: // frame.eval returns null if the eval code fails with an uncatchable error.
michael@0: 
michael@0: var g = newGlobal();
michael@0: var dbg = Debugger(g);
michael@0: var hits = 0;
michael@0: dbg.onDebuggerStatement = function (frame) {
michael@0:     if (hits++ === 0)
michael@0:         assertEq(frame.eval("debugger;"), null);
michael@0:     else
michael@0:         return null;
michael@0: };
michael@0: assertEq(g.eval("debugger; 'ok';"), "ok");
michael@0: assertEq(hits, 2);