When debugging a program, programmers often find it helpful to examine
the program's internal status while it runs: the values of internal
variables, the choices made in if and cond statements, and
so forth. Guile Scheme provides a debugging interface that programmers
can use to single-step through Scheme functions and examine symbol
bindings. This is different from the section Internal Debugging Interface, which permits programmers to debug the Guile interpreter
itself. Most programmers will be more interested in debugging their own
Scheme programs than the interpreter which evaluates them.
[FIXME: should we include examples of traditional debuggers
and explain why they can't be used to debug interpreted Scheme or Lisp?]
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