1 files changed, 23 insertions, 0 deletions
diff --git a/js/src/tests/non262/lexical-environment/unscopables-closures.js b/js/src/tests/non262/lexical-environment/unscopables-closures.js
new file mode 100644
index 0000000000..bdade1f113
--- /dev/null
+++ b/js/src/tests/non262/lexical-environment/unscopables-closures.js
@@ -0,0 +1,23 @@
+// @@unscopables continues to work after exiting the relevant `with` block,
+// if the environment is captured by a closure.
+
+let env = {
+    x: 9000,
+    [Symbol.unscopables]: {x: true}
+};
+
+function make_adder(x) {
+    with (env)
+        return function (y) { return x + y; };
+}
+assertEq(make_adder(3)(10), 13);
+
+// Same test, but with a bunch of different parts for bad luck
+let x = 500;
+function make_adder_with_eval() {
+    with (env)
+        return eval('y => eval("x + y")');
+}
+assertEq(make_adder_with_eval()(10), 510);
+
+reportCompare(0, 0);