1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/tests/non262/lexical-environment/unscopables-ignored.js b/js/src/tests/non262/lexical-environment/unscopables-ignored.js
new file mode 100644
index 0000000000..08b042a3b5
--- /dev/null
+++ b/js/src/tests/non262/lexical-environment/unscopables-ignored.js
@@ -0,0 +1,22 @@
+// In these cases, @@unscopables should not be consulted.
+
+// Because obj has no properties `assertEq` or `x`,
+// obj[@@unscopables] is not checked here:
+var obj = {
+    get [Symbol.unscopables]() {
+        throw "tried to read @@unscopables";
+    }
+};
+var x = 3;
+with (obj)
+    assertEq(x, 3);
+
+// If @@unscopables is present but not an object, it is ignored:
+for (let nonObject of [undefined, null, "nothing", Symbol.for("moon")]) {
+    let y = 4;
+    let obj2 = {[Symbol.unscopables]: nonObject, y: 5};
+    with (obj2)
+        assertEq(y, 5);
+}
+
+reportCompare(0, 0);