[cvs-nhc98] patch applied (hat): Improve pattern-parsing to return more informative error messages.

Tue Feb 11 04:04:28 PST 2003 malcolm * Improve pattern-parsing to return more informative error messages. Also, correct the omission of pattern-matching on named field exprs. (Unfortunately, the parser still cannot read a field pattern typed by the user, but at least you now get an error rather than 'no match', and the alterative pattern (C _) now works.) M ./src/hattools/HatObserve.hs -18 +19 M ./src/hattools/Pattern.hs -5 +8