[GHC] #14558: Unable to parse integer-gmp's Cabal file

[GHC]

#14558: Unable to parse integer-gmp's Cabal file
-------------------------------------+-------------------------------------
           Reporter:  taylorfausak   |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Core           |           Version:  8.2.2
  Libraries                          |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 integer-gmp version 1.0.1.0 has this line in
 [https://hackage.haskell.org/package/integer-gmp-1.0.1.0/revision/0.cabal
 its Cabal file]: {{{ build-depends: ghc-prim ^>= 0.5.1.0 }}}

 That uses the new caret constraint syntax. That syntax was introduced by
 Cabal 2 a few months ago in July/August. Attempting to build integer-gmp
 with a slightly older version of Cabal, like 1.24.2.0, or with the latest
 released version of Stack (1.5.1) fails with this error:

 {{{ Unable to parse cabal file for integer-gmp-1.0.1.0: NoParse "build-
 depends" 58 }}}

 This was reported on Stack's issue tracker and on Reddit:

 - https://github.com/commercialhaskell/stack/issues/3624
 -
 https://www.reddit.com/r/haskell/comments/7hs20y/how_to_fix_stack_unable_to_parse_cabal_file/

 I was not able to find an issue tracker for integer-gmp. Someone suggested
 that I open an issue here instead.

 I can see how this isn't a bug per se because integer-gmp's Cabal file
 specifies {{{ cabal-version: 2.0}}}. Nevertheless, it's frustrating that a
 core library is using a bleeding edge feature for basically no reason. It
 would be nice if integer-gmp used the more typical {{{ cabal-version: >=
 1.10}}} and specified its dependency as {{{ build-depends: ghc-prim >=
 0.5.1 && <0.6}}}, without the caret operator.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14558>
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