Bug 653428 – [haskell overlay] dev-haskell/testing-feat does not compile: Ambiguous occurrence ‘<>’

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Hans de Graaff 2018-04-17 17:59:35 UTC]

Created attachment 527872 [details]
build.log

[4 of 9] Compiling Test.Feat.Enumerate ( Test/Feat/Enumerate.hs, dist/build/Test/Feat/Enumerate.o )

Test/Feat/Enumerate.hs:172:30: error:
    Ambiguous occurrence ‘<>’
    It could refer to either ‘Data.Semigroup.<>’,
                             imported from ‘Data.Semigroup’ at Test/Feat/Enumerate.hs:48:1-21
                          or ‘Data.Monoid.<>’,
                             imported from ‘Data.Monoid’ at Test/Feat/Enumerate.hs:51:1-18

Test/Feat/Enumerate.hs:179:14: error:
    Ambiguous occurrence ‘<>’
    It could refer to either ‘Data.Semigroup.<>’,
                             imported from ‘Data.Semigroup’ at Test/Feat/Enumerate.hs:48:1-21
                          or ‘Data.Monoid.<>’,
                             imported from ‘Data.Monoid’ at Test/Feat/Enumerate.hs:51:1-18

[Comment 1 Hans de Graaff 2018-04-19 18:53:32 UTC]

It turns out that this is specific to the version currently in the haskell overlay, most likely due to https://github.com/gentoo-haskell/gentoo-haskell/commit/c611c1a8648da1eea5bb0520a824a5a3affdbf59

The version in the gentoo tree compiles fine for me.

Using dev-lang/ghc-8.0.2.

[Comment 2 Sergei Trofimovich (RETIRED) 2018-04-21 22:15:30 UTC]

Sorry about the breakage. Fixed as:
    https://github.com/gentoo-haskell/gentoo-haskell/commit/4ed93e512f8403be4f7d8977c0bbef0d10de9bf8