A variety of alternative parser combinator libraries, including the original
HuttonMeijer set. The Poly sets have features like good error reporting,
arbitrary token type, running state, lazy parsing, and so on. Finally,
Text.Parse is a proposed replacement for the standard Read class, for better
deserialisation of Haskell values from Strings.

After uninstalling, run this command to unregister the package from
the ghc package database:   ghc-pkg recache
