#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_... 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 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler