1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-onPop-generators-05.js b/js/src/jit-test/tests/debug/Frame-onPop-generators-05.js
new file mode 100644
index 0000000000..09d66d7c84
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-onPop-generators-05.js
@@ -0,0 +1,29 @@
+// In .onPop for the "initial yield" of a generator, while the generator frame
+// is on the stack, the generator object's .next() method throws.
+
+let g = newGlobal({newCompartment: true});
+g.eval(`
+    function* f() {
+        return "ok";
+    }
+`);
+
+let hits = 0;
+let dbg = new Debugger;
+let gw = dbg.addDebuggee(g);
+dbg.onEnterFrame = frame => {
+    dbg.onEnterFrame = undefined;  // Trigger only once.
+    frame.onPop = completion => {
+        // Initial yield.
+        let genObj = completion.return;
+        assertEq(genObj.class, "Generator");
+        let result = frame.evalWithBindings("genObj.next()", {genObj});
+        assertEq(result.throw.class, "TypeError");
+        assertEq(result.throw.getProperty("message").return,
+                 "already executing generator");
+        hits++;
+    };
+};
+
+g.f();
+assertEq(hits, 1);