This issue was known in hflags: https://github.com/errge/hflags/issues/8 (Opened Jun 30, 2014) and in ghc: https://ghc.haskell.org/trac/ghc/ticket/9768 And it's not a bug, as you can see from discussion in both tickets and reference to ghc-7.8 documentation. On 6 February 2015 at 17:28, Maurizio Vitale wrote:

That was it, thanks. I would have never figured it out on my own.

I've reported this issue in the hflags bugtracker (to get the workaround in the docs). Hope it will be propagated to ghc if it is not already known.

On Fri, Feb 6, 2015 at 4:28 AM, Claude Heiland-Allen wrote:

...

On 06/02/15 06:26, Maurizio Vitale wrote:

...

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."

return []

-- see http://hackage.haskell.org/package/QuickCheck-2.7.6/docs/Test-QuickCheck-All... - I haven't tested with hflags but it looks like the same issue from first glance

...

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 seen.

Any idea/suggestion?

Thanks,

Maurizio

Claude -- http://mathr.co.uk

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Alexander