On Tue, Mar 23, 2010 at 10:00 AM, Roel van Dijk
The documentation for Data.Version might be insightful:
http://haskell.org/ghc/docs/latest/html/libraries/base-4.2.0.0/Data-Version....
If Cabal uses the parseVersion function to parse versions then the following version is valid: "1.2.3-a-b-c". If should result in this value:
Version {versionBranch = [1,2,3], versionTags = ["a", "b", "c"]}
But I don't know if Cabal allows you to depend on such a version.
This post has an answer, but not one that makes me very happy ;-) http://www.mail-archive.com/cabal-devel@haskell.org/msg05955.html "We've not yet removed tag from the parser for backwards compatibility. Clearly what we should do is add a big warning (or simply error) that such tags are no longer supported. I hope in time to get Data.Version changed to eliminate the tags entirely." (Duncan Coutts) I guess it's too easy to abuse (says he who was planning to abuse it) but it's sad that there isn't something I can easily use in its place. At the moment renaming the package is serving my purpose. Cheers, D -- Dougal Stanton dougal@dougalstanton.net // http://www.dougalstanton.net