I don't know yet the appropriate place to mention this shortcoming so I post here. I did a cut and paste of the parser in the excellent paper "Polish Parsers, Step by Step ". But that did not compile. Hopefully the syntax highlighting in emacs and yi gave me a clue. infixl had a ligature!
I don't know if a compiler is supposed to know about typography but without the yi and emacs help, I would still search the problem. → and ← were accepted by ghc 6.10.1 but were flagged as problematic by yi. --~--~---------~--~----~------------~-------~--~----~ Yi development mailing list yi-devel@googlegroups.com http://groups.google.com/group/yi-devel -~----------~----~----~----~------~----~------~--~---