Please add support for latest version of intervals library

[peti]

I'm trying to update several packages in NixOS, but these updates cause build errors with diagrams-lib. There seems to be missing constructor I? Not sure what is going on. A complete build log is at http://hydra.cryp.to/build/45141/nixlog/2/raw.

[peti]

Apparently, the issue is caused by the update to intervals version 0.7. I'll just defer that update for the time being ... but it would be great if an updated version of diagrams-lib could be released that supports the latest version of the intervals package!

[byorgey]

Did you edit diagrams-lib.cabal to remove the dependency upper bounds? Otherwise I don't understand why your build would have chosen intervals-0.5.1.1, since we specify intervals < 0.5. That's your perogative, of course, but ignoring the upper bounds and then filing build errors when it doesn't work is not particularly helpful.

We are aware of the issue; see ekmett/intervals#12 and commercialhaskell/stackage#204. Given that intervals has been changing rapidly (it has had three major version bumps since Friday) it seems prudent to wait a bit until the dust settles.

[peti]

@byorgey, yes, we had to "jailbreak" diagram-lib in NixOS/nixpkgs@9308d93 to work around overly restrictive dependency specifications. You are right that there is no build error with the upper bound on intervals in place. It's just that we would like to update intervals to the latest version, and it would be great if diagrams-lib would co-exist with that new version.

[byorgey]

Note that as of the 1.1 release diagrams-lib works with the latest semigroups.

[peti]

Yes, I know.

[byorgey]

Fixed in diagrams-lib-1.1.0.4.