Dear Russell, as the maintainer of Haskell packages in Debian, I greatly care about having all of our Haskell packages to be co-installable. The stackage project helps us a lot in achieving this goal.
data-lens depends on an older version of semigroupoids than is available on hackage and stackage. If you add your packages to stackage, you’ll get early notification about such issues, and also other QA for free. See http://www.stackage.org/authors for how to add your package to this curated package set. Greetings, Joachim -- Joachim "nomeata" Breitner Debian Developer [email protected] | ICQ# 74513189 | GPG-Keyid: F0FBF51F JID: [email protected] | http://people.debian.org/~nomeata
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