1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/generators/bug1664463.js b/js/src/jit-test/tests/generators/bug1664463.js
new file mode 100644
index 0000000000..a6a45b4907
--- /dev/null
+++ b/js/src/jit-test/tests/generators/bug1664463.js
@@ -0,0 +1,31 @@
+// |jit-test| skip-if: !('gc' in this) || !('drainJobQueue' in this)
+// Test that an unused local in an async function is not kept alive by a closure
+// (bug 1412202). Based on a test case by Andy Wingo in bug 1664463.
+
+let nfinalized = 0;
+let finalizers = new FinalizationRegistry(f => { nfinalized++; });
+
+class A {
+  constructor(callback) {
+    this.b = {callback};
+    finalizers.register(this, this.b, this);
+  }
+}
+
+const LOOP_COUNT = 200;
+const FINALIZER_COUNT = 200;
+
+async function main() {
+  for (let j = 0; j < LOOP_COUNT; j++) {
+    for (let i = 0; i < FINALIZER_COUNT; i++) {
+      let console = globalThis.console;
+      let obj = new A(() => console.log("hello"));
+    }
+    drainJobQueue();
+  }
+
+  gc();
+  drainJobQueue();
+  assertEq(nfinalized, LOOP_COUNT * FINALIZER_COUNT, "all objects should be finalized");
+}
+main();