Text.ParserCombinators.Parsec requires -package text.

[George Russell]

With
    ghc ParsecTest.hs -o pt
you get a link-time failure, because it looks as if the base package
Text.ParserCombinators.Parsec depends somehow on the package "text".
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module Main where

import Text.ParserCombinators.Parsec

ch = char 'C'

main = 
   do
      seq ch (return ())