wumpus-basic

Copperbox revision 1902.

More work on the v4.1 parser. Unfortunately I've discovered a pervasive bug in the parser combinators - if a parser is annotated with an error message via the substError[*] combinator it cannot be used by the manyTill parser. Currently I don't know how to fix this.

[*] I can't get the name to print with Blogger - it is really question-mark-inside-angle-brackets.