1 files changed, 18 insertions, 0 deletions
diff --git a/js/src/tests/non262/lexical-environment/unscopables-global.js b/js/src/tests/non262/lexical-environment/unscopables-global.js
new file mode 100644
index 0000000000..1aa4a52bda
--- /dev/null
+++ b/js/src/tests/non262/lexical-environment/unscopables-global.js
@@ -0,0 +1,18 @@
+// @@unscopables does not affect the global environment.
+
+this.x = "global property x";
+let y = "global lexical y";
+this[Symbol.unscopables] = {x: true, y: true};
+assertEq(x, "global property x");
+assertEq(y, "global lexical y");
+assertEq(eval("x"), "global property x");
+assertEq(eval("y"), "global lexical y");
+
+// But it does affect `with` statements targeting the global object.
+{
+    let x = "local x";
+    with (this)
+        assertEq(x, "local x");
+}
+
+reportCompare(0, 0);