Bug#875556: haskell-text-show: FTBFS in unstable due to overlapping instances

[James Clarke]

Source: haskell-text-show
Version: 3.4.1.1-1
Severity: serious

Hi,
haskell-text-show now FTBFS in unstable[0] due to overlapping instances;
the relevant part of the build log is given below:

> tests/Spec/Data/List/NonEmptySpec.hs:27:32: error:
>     * Overlapping instances for Data.Functor.Classes.Show1 NonEmpty
>         arising from a use of `prop_matchesTextShow1'
>       Matching instances:
>         instance Data.Functor.Classes.Show1 NonEmpty
>           -- Defined in `Data.Orphans'
>         instance Data.Functor.Classes.Show1 NonEmpty
>           -- Defined at tests/Instances/Data/List/NonEmpty.hs:20:3
>     * In the second argument of `prop', namely
>         `(prop_matchesTextShow1 :: Int -> NonEmpty Int -> Bool)'
>       In the second argument of `($)', namely
>         `prop
>            "TextShow1 instance"
>            (prop_matchesTextShow1 :: Int -> NonEmpty Int -> Bool)'
>       In the expression:
>         parallel . describe "NonEmpty Int"
>         $ prop
>             "TextShow1 instance"
>             (prop_matchesTextShow1 :: Int -> NonEmpty Int -> Bool)

Regards,
James

[0] https://buildd.debian.org/status/fetch.php?pkg=haskell-text-show&arch=sparc64&ver=3.4.1.1-1%2Bb1&stamp=1505187046&raw=0