This is a library of parser combinators, originally written by Koen Claessen.
It parses all alternatives in parallel, so it never keeps hold of
the beginning of the input string, a common source of space leaks with
other parsers. The '(+++)' choice combinator is genuinely commutative;
it makes no difference which branch is "shorter".
See also Koen's paper Parallel Parsing Processes
This version of ReadP has been locally hacked to make it H98, by
Martin Sjögren mailto:firstname.lastname@example.org