[Haskell] pretty-printing Haskell with automatic parens?

[Conal Elliott]

The haskell-src package contains a pretty-printer for Haskell syntax that
requires parentheses to be explicitly placed in the (abstract) syntax
representation.  I have some code for automatically inserting parentheses
where necessary (for use before pretty-printing), but I'm guessing someone
else has done so better than I.  Does anyone have pointers?  I'm glad to
share my version as well.

Cheers, - Conal
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