On 20 January 2011 17:30, Gwern Branwen
* You need to loosen the base upper bound to < 4.4 * If using base >= 4, you need to depend on the syb package as well (current version 0.3)
Would this break GHC 6.12 builds?
Thats why I suggested the flag stanza. Cabal has a weird kind of flag semantics where it will try every possible combination of flags until it finds one that builds. The solution I suggested uses this behaviour to either depend on base >= 4 && < 4.4 WITH syb, OR base < 4 WITHOUT syb. Because of the default flag setting of True, the first possibility will be tried first, but it if fails Cabal will just fall back on base < 4. In short, it should work perfectly for either GHC 7 or 6.12 clients (modulo syntax issues - I haven't actually tried the syntax I sent you).
data-memocombinators is only the tip of the iceberg; I believe much of lambdabot would need modifications. (Apparently Control.OldException has gone away, which alone guarantees many changes.) So there wouldn't be much point to changing show.
Actually, I: * Fixed the show upper bound * Fixed data-memocombinators and data-inttrie upper bounds (and sent a pull request to get Luke to take these changes upstream) * Got Wouter to change the upper bound on IOSpec (will be in the 0.2.2 release, out soon) And after all that lambdabot seemed to compile OK (though I got a link-time error about iconv because I'm on a Mac). So if you fix show GHC 7 users will be able to cabal install lambdabot! Cheers, Max