1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/non262/lexical-environment/block-scoped-functions-annex-b-with.js b/js/src/tests/non262/lexical-environment/block-scoped-functions-annex-b-with.js
new file mode 100644
index 0000000000..f57f04b885
--- /dev/null
+++ b/js/src/tests/non262/lexical-environment/block-scoped-functions-annex-b-with.js
@@ -0,0 +1,26 @@
+if (typeof getBuildConfiguration === "undefined") {
+  var getBuildConfiguration = SpecialPowers.Cu.getJSTestingFunctions().getBuildConfiguration;
+}
+
+// Global functions are configurable in a browser environment on nightly.
+var functionDeclarationsConfigurable = typeof document !== "undefined" &&
+                                       !getBuildConfiguration().release_or_beta;
+
+var o = { f: "string-f" };
+with (o) {
+  var desc = Object.getOwnPropertyDescriptor(this, "f");
+  assertEq(desc.value, undefined);
+  assertEq(desc.writable, true);
+  assertEq(desc.enumerable, true);
+  assertEq(desc.configurable, functionDeclarationsConfigurable);
+  function f() {
+    return "fun-f";
+  }
+}
+
+// Annex B explicitly assigns to the nearest VariableEnvironment, so the
+// with-object "o" should have its property unchanged.
+assertEq(o.f, "string-f");
+assertEq(f(), "fun-f");
+
+reportCompare(true, true)