1 files changed, 15 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/bug1106982-2.js b/js/src/jit-test/tests/basic/bug1106982-2.js
new file mode 100644
index 0000000000..1983c4b04f
--- /dev/null
+++ b/js/src/jit-test/tests/basic/bug1106982-2.js
@@ -0,0 +1,15 @@
+var x = "wrong";
+var t = {x: "x"};
+var hits = 0;
+var p = new Proxy(t, {
+    has(t, id) {
+        var found = id in t;
+        if (++hits == 2)
+            delete t[id];
+        return found;
+    },
+    get(t, id) { return t[id]; }
+});
+evaluate(`x += " x";`, {envChainObject: p});
+assertEq(hits, 2);
+assertEq(t.x, "undefined x");