[Haskell-cafe] hflags

Maurizio Vitale mrz.vtl at gmail.com
Fri Feb 6 06:26:37 UTC 2015

with ghc 7.8.4 and hflags 0.4 the following program:

{-# LANGUAGE TemplateHaskell #-}

module Main where

import HFlags

defineFlag "f" True "A flag."
--defineFlag "g" True "Another  flag."

main = do
  _ <- $initHFlags "flags demo"
  print Main.flags_f

gives me a runtime error about the flag f not being found, unless I add the
declaration of a second flag. It seems like the last flag definition is not

Any idea/suggestion?


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