In certain contexts (e.g., non-interactive applications), it may be
desirable to turn off the SBCL debugger (and possibly re-enable it).
The functions here control the debugger.
— Function: disable-debugger [sb-ext]
When invoked, this function will turn off both the sbcl debugger
and ldb (the low-level debugger). See also enable-debugger.
— Function: enable-debugger [sb-ext]
Restore the debugger if it has been turned off by disable-debugger.