1 files changed, 16 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/bug1397385.js b/js/src/jit-test/tests/debug/bug1397385.js
new file mode 100644
index 0000000000..eea2c0c01e
--- /dev/null
+++ b/js/src/jit-test/tests/debug/bug1397385.js
@@ -0,0 +1,16 @@
+var g = newGlobal({newCompartment: true});
+
+g.evaluate(`
+    function testInnerFun(defaultArg = 1) {
+        function innerFun(expectedThis) { return this; }
+        h();
+        return innerFun; // To prevent the JIT from optimizing out innerFun.
+    }
+`);
+
+g.h = function () {
+    var res = (new Debugger(g)).getNewestFrame().eval('assertEq(innerFun(), this)');
+    assertEq("return" in res, true);
+}
+
+g.testInnerFun();