Fri, 09 Jul 2010 16:32:25 +0200 krauss added "while_option", which needs no well-foundedness; defined "while" in terms of "while_option"
Fri, 09 Jul 2010 10:08:10 +0200 haftmann avoid slightly odd "M" suffix; rename mapM to fold_map (fold_map_abort would be more correct, though)
Fri, 09 Jul 2010 09:48:54 +0200 haftmann adapted to changes
Fri, 09 Jul 2010 09:48:53 +0200 haftmann guard combinator
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