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(slib.info)Breakpoints

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Breakpoints
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  `(require 'break)'

 - Function: init-debug
     If your Scheme implementation does not support `break' or `abort',
     a message will appear when you `(require 'break)' or `(require
     'debug)' telling you to type `(init-debug)'.  This is in order to
     establish a top-level continuation.  Typing `(init-debug)' at top
     level sets up a continuation for `break'.

 - Function: breakpoint arg1 ...
     Returns from the top level continuation and pushes the
     continuation from which it was called on a continuation stack.

 - Function: continue
     Pops the topmost continuation off of the continuation stack and
     returns an unspecified value to it.

 - Function: continue arg1 ...
     Pops the topmost continuation off of the continuation stack and
     returns ARG1 ... to it.

 - Macro: break proc1 ...
     Redefines the top-level named procedures given as arguments so that
     `breakpoint' is called before calling PROC1 ....

 - Macro: break
     With no arguments, makes sure that all the currently broken
     identifiers are broken (even if those identifiers have been
     redefined) and returns a list of the broken identifiers.

 - Macro: unbreak proc1 ...
     Turns breakpoints off for its arguments.

 - Macro: unbreak
     With no arguments, unbreaks all currently broken identifiers and
     returns a list of these formerly broken identifiers.

  These are _procedures_ for breaking.  If defmacros are not natively
supported by your implementation, these might be more convenient to use.

 - Function: breakf proc
 - Function: breakf proc name
     To break, type
          (set! SYMBOL (breakf SYMBOL))

     or
          (set! SYMBOL (breakf SYMBOL 'SYMBOL))

     or
          (define SYMBOL (breakf FUNCTION))

     or
          (define SYMBOL (breakf FUNCTION 'SYMBOL))

 - Function: unbreakf proc
     To unbreak, type
          (set! SYMBOL (unbreakf SYMBOL))