[Haskell-cafe] hflags

[Alexander V Vershilov]

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 <mrz.vtl at gmail.com> 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 <claude at mathr.co.uk>
> 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.html#v:quickCheckAll
>> - 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
>>
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>
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-- 
Alexander