1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Environment-identity-04.js b/js/src/jit-test/tests/debug/Environment-identity-04.js
new file mode 100644
index 0000000000..607b871817
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Environment-identity-04.js
@@ -0,0 +1,19 @@
+// Observably different visits to the same with-statement produce distinct Environments.
+
+var g = newGlobal({newCompartment: true});
+g.eval("function f(a, obj) { with (obj) return function () { return a; }; }");
+var dbg = Debugger(g);
+var hits = 0;
+dbg.onDebuggerStatement = function (frame) {
+    // Even though the two visits to the with-statement have the same target
+    // object, Math, the environments are observably different.
+    var f1 = frame.eval("f(1, Math);").return;
+    var f2 = frame.eval("f(2, Math);").return;
+    assertEq(f1.environment !== f2.environment, true);
+    assertEq(f1.object, f2.object);
+    assertEq(f1.call().return, 1);
+    assertEq(f2.call().return, 2);
+    hits++;
+};
+g.eval("debugger;");
+assertEq(hits, 1);