The GUD (Grand Unified Debugger) library provides an interface to
various symbolic debuggers from within Emacs. We recommend the debugger
GDB, which is free software, but you can also run DBX, SDB or XDB if you
have them. GUD can also serve as an interface to the Perl's debugging
mode, the Python debugger PDB, and to JDB, the Java Debugger.
See section `The Lisp Debugger' in the Emacs Lisp Reference Manual,
for information on debugging Emacs Lisp programs.
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