is a variable defined in `
Its value is
- This variable may be risky if used as a file-local variable.
Hook run after entering Debugger mode.
No problems result if this variable is not bound.
`add-hook' automatically binds it. (This is true for all hook variables.)
You can customize this variable.
This variable was introduced, or its default value was changed, in
version 20.3 of Emacs.