1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/tests/non262/lexical-environment/bug-1216623.js b/js/src/tests/non262/lexical-environment/bug-1216623.js
new file mode 100644
index 0000000000..cbdbe9722e
--- /dev/null
+++ b/js/src/tests/non262/lexical-environment/bug-1216623.js
@@ -0,0 +1,19 @@
+// Scoping in the head of for(let;;) statements.
+
+let x = 0;
+for (let i = 0, a = () => i; i < 4; i++) {
+  assertEq(i, x++);
+  assertEq(a(), 0);
+}
+assertEq(x, 4);
+
+x = 11;
+let q = 0;
+for (let {[++q]: r} = [0, 11, 22], s = () => r; r < 13; r++) {
+  assertEq(r, x++);
+  assertEq(s(), 11);
+}
+assertEq(x, 13);
+assertEq(q, 1);
+
+reportCompare(0, 0);