| Summary: | [haskell overlay] dev-haskell/transformers-0.4.3.0 - Control/Monad/Trans/Error.hs:69:10: error: Duplicate instance declarations: instance MonadPlus IO | ||
|---|---|---|---|
| Product: | Gentoo Linux | Reporter: | Alessandro Di Federico <ale> |
| Component: | Current packages | Assignee: | Gentoo's Haskell Language team <haskell> |
| Status: | CONFIRMED --- | ||
| Severity: | normal | CC: | ale |
| Priority: | Normal | ||
| Version: | unspecified | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Package list: | Runtime testing required: | --- | |
| Attachments: | build.log | ||
ghc-8.0.2 comes with transformers-0.5.2.0. Your system should use those. Do you know what holds old transformers back for you? |
Created attachment 517868 [details] build.log dev-haskell/transformers-0.4.3.0 fails to build with dev-lang/ghc-8.0.2 with the attached error message. Control/Monad/Trans/Error.hs:69:10: error: Duplicate instance declarations: instance MonadPlus IO -- Defined at Control/Monad/Trans/Error.hs:69:10 instance MonadPlus IO -- Defined in ‘GHC.Base’ Control/Monad/Trans/Error.hs:73:10: error: Duplicate instance declarations: instance Alternative IO -- Defined at Control/Monad/Trans/Error.hs:73:10 instance Alternative IO -- Defined in ‘GHC.Base’