1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Environment-setVariable-12.js b/js/src/jit-test/tests/debug/Environment-setVariable-12.js
new file mode 100644
index 0000000000..6806ad9196
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Environment-setVariable-12.js
@@ -0,0 +1,21 @@
+// setVariable can create a new property on a with block's bindings object, if
+// it is shadowing an existing property on the prototype chain.
+
+var g = newGlobal({newCompartment: true});
+var dbg = Debugger(g);
+dbg.onDebuggerStatement = function (frame) {
+    var env = frame.environment.find("x");
+    env.setVariable("x", 2);
+};
+g.eval("var obj1 = {x: 1}, obj2 = Object.create(obj1), z; with (obj2) { debugger; z = x; }");
+assertEq(g.obj1.x, 1);
+assertEq(g.obj2.x, 2);
+assertEq(g.z, 2);
+
+// The property created by setVariable is like the one created by ordinary
+// assignment in a with-block.
+var desc = Object.getOwnPropertyDescriptor(g.obj2, "x");
+assertEq(desc.configurable, true);
+assertEq(desc.enumerable, true);
+assertEq(desc.writable, true);
+assertEq(desc.value, 2);