Re: [ANNOUNCE] GHC 8.6.1-alpha2 available

2018-07-20 Thread Andrés Sicard-Ramírez 
On 15 July 2018 at 20:07, Ben Gamari  wrote:
>
> The GHC development team is pleased to announce the second alpha release
> leading up to GHC 8.6.1.

The following MVE uses the gitrev library (
http://hackage.haskell.org/package/gitrev ):

$ cat Test.hs

{-# LANGUAGE TemplateHaskell #-}

module Main where

import Development.GitRev

commitInfo :: Maybe String
commitInfo = case $(gitHash) of
  "UNKNOWN" -> Nothing
  hash  -> Just hash

main :: IO ()
main = print commitInfo


The MVE compiles *without* warnings with different versions of GHC
(e.g. 8.4.3) but with GHC 8.6.1-alpha2 I get the following warning:

$ ghc Test.hs

Test.hs:10:3: warning: [-Woverlapping-patterns]
Pattern match is redundant
In a case alternative: hash -> ...
   |
10 |   hash  -> Just hash
   |   ^^
Linking Test ...

Is it a bug or is it the expected behaviour?


Best,


-- 
Andrés
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Re: [ANNOUNCE] GHC 8.6.1-alpha2 available

2018-07-19 Thread Jens Petersen 
On 16 July 2018 at 10:07, Ben Gamari  wrote:
> The GHC development team is pleased to announce the second alpha release 
> leading up to GHC 8.6.1.

Thanks, I built it for Fedora and EPEL7 in my Copr repo:

https://copr.fedorainfracloud.org/coprs/petersen/ghc-8.6.1/

Jens
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