diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Environment-setVariable-WouldRun.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Environment-setVariable-WouldRun.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+// setVariable triggering a setter doesn't crash or explode.
+// It should throw WouldRunDebuggee, but that isn't implemented yet.
+
+function test(code) {
+    var g = newGlobal();
+    g.eval("function d() { debugger; }");
+    var dbg = Debugger(g);
+    var hits = 0;
+    dbg.onDebuggerStatement = function (frame) {
+        var env = frame.environment.find("x");
+        try {
+            env.setVariable("x", 0);
+        } catch (exc) {
+        }
+        hits++;
+    };
+    g.eval(code);
+}
+
+test("Object.defineProperty(this, 'x', {set: function (v) {}}); d();");
+test("Object.defineProperty(Object.prototype, 'x', {set: function (v) {}}); d();");
+test("with ({set x(v) {}}) eval(d());");