benarmston / cabal-constraints Goto Github PK

Hi Ben,

I just tried cabal-constraints on a project installed in a cabal sandbox getting the error:
cabal-constraints: Prelude.read: no parse

dan@machine ~> ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.6.2

dan@machine ~> cabal --version
cabal-install version 1.18.0.2
using version 1.18.1 of the Cabal library

Any ideas?

Greetings,
Daniel

cabal-constraints must be built against the same version of Cabal as is being used to build the project it is being run against. However, it accepts both Cabal 1.16.* and 1.18.*. If it is built prior to the user installing Cabal 1.18 very odd error messages will be presented to the user. See issue #1 for an example of this.

Perhaps the solution is to require Cabal 1.18. This may not be such a bad idea as cabal-constraints is most useful when used with cabal sandboxes, and support for cabal.config both of which require cabal-install 1.18 and Cabal 1.18.