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fixed a few bugs in gforth.el
more documentation

    1: \ assertions
    2: 
    3: \ !! factor out line number printing, share with debugging.fs
    4: 
    5: variable assert-level \ all assertions above this level are turned off
    6: 1 assert-level !
    7: 
    8: : assertn ( n -- )
    9:     \ this is internal (it is not immediate)
   10:     assert-level @ >
   11:     if
   12: 	POSTPONE (
   13:     then ;
   14: 
   15: : assert0( ( -- )
   16:     \ important assertions that should always be turned on
   17:     0 assertn ; immediate
   18: : assert1( ( -- )
   19:     \ normal assertions; turned on by default
   20:     1 assertn ; immediate
   21: : assert2( ( -- )
   22:     \ debugging assertions
   23:     2 assertn ; immediate
   24: : assert3( ( -- )
   25:     \ slow assertions that you may not want to turn on in normal debugging;
   26:     \ you would turn them on mainly for thorough checking
   27:     3 assertn ; immediate
   28: : assert( ( -- )
   29:     \ equivalent to assert1(
   30:     POSTPONE assert1( ; immediate
   31: 
   32: : (endassert) ( flag -- )
   33:     \ three inline arguments
   34:     if
   35: 	r> 3 cells + >r EXIT
   36:     else
   37: 	r>
   38: 	dup 2@ type ." :" cell+ cell+
   39: 	@ 0 .r ." : failed assertion"
   40: 	true abort" assertion failed" \ !! or use a new throw code?
   41:     then ;
   42: 
   43: : ) ( -- )
   44:     POSTPONE (endassert) loadfilename 2@ 2, loadline @ , ; immediate