##-
# Author: Brian Tiffin
# Dedicated to the public domain
#
# Date: August 2016
# Modified: 2016-10-03/23:15-0400
##+
#
# preproc-undef, demonstrate $undef preprocessor directive
#
procedure main()
$define STUB 1
$ifndef STUB 
    write("skip over some code")
$else
    write("Unicon, cui non; sold, in Italian")
$undef STUB
$endif

$ifndef STUB 
    write("don't skip over this code")
$else
    write("do skip over this code")
$endif
end