1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/execution-observability-01.js b/js/src/jit-test/tests/debug/execution-observability-01.js
new file mode 100644
index 0000000000..1f6dd13f04
--- /dev/null
+++ b/js/src/jit-test/tests/debug/execution-observability-01.js
@@ -0,0 +1,22 @@
+// For perf reasons we don't recompile all a debuggee global's scripts when
+// Debugger no longer needs to observe all execution for that global. Test that
+// things don't crash if we try to run a script with a BaselineScript that was
+// compiled with debug instrumentation when the global is no longer a debuggee.
+
+var g = newGlobal({newCompartment: true});
+var dbg = new Debugger(g);
+var counter = 0;
+dbg.onDebuggerStatement = function (frame) {
+  counter++;
+  if (counter == 15)
+    dbg.onDebuggerStatement = undefined;
+};
+
+g.eval("" + function f() {
+  {
+    let inner = 42;
+    debugger;
+    inner++;
+  }
+});
+g.eval("for (var i = 0; i < 20; i++) f()");