1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/bug1557343-2.js b/js/src/jit-test/tests/debug/bug1557343-2.js
new file mode 100644
index 0000000000..7eb340ff6d
--- /dev/null
+++ b/js/src/jit-test/tests/debug/bug1557343-2.js
@@ -0,0 +1,30 @@
+// |jit-test| --no-ggc
+// Don't crash when two Debugger.Frames refer to the same generator script, and
+// then one returns.
+
+var g = newGlobal({ newCompartment: true });
+g.eval(`
+  function* gen() {
+    debugger;
+    yield 1;
+  }
+
+  function use_gen() {
+    var gen1 = gen();
+    var gen2 = gen();
+
+    gen1.next();
+    gen2.next();
+
+    gen1.next();
+    gen2.next();
+  }
+`);
+
+var dbg = new Debugger(g);
+var frame;
+dbg.onDebuggerStatement = f => {
+  frame = f;
+};
+
+g.use_gen();