Log Message:
Import polyparse-1.9 as wip/hs-polyparse.

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.