Ad primitive debugger interface (so far it will step and show you the
source, but it doesn't yet show the stack).
diff --git a/Tools/idle/Bindings.py b/Tools/idle/Bindings.py
index 85ae564..4138d26 100644
--- a/Tools/idle/Bindings.py
+++ b/Tools/idle/Bindings.py
@@ -109,6 +109,7 @@
     
     ("debug", "Go to line from traceback", None, "<<goto-traceback-line>>"),
     ("debug", "Open stack viewer", None, "<<open-stack-viewer>>"),
+    ("debug", "Toggle debugger", None, "<<toggle-debugger>>"),
     
     # Help menu