Resolving dependencies...
cabal: Could not resolve dependencies:
trying: papillon-0.1.0.6 (user goal)
next goal: template-haskell (dependency of papillon-0.1.0.6)
rejecting: template-haskell-2.12.0.0/installed-2.1... (conflict: papillon =>
template-haskell==2.13.*)
rejecting: template-haskell-2.13.0.0, template-haskell-2.12.0.0,
template-haskell-2.11.1.0, template-haskell-2.11.0.0,
template-haskell-2.10.0.0, template-haskell-2.9.0.0, template-haskell-2.8.0.0,
template-haskell-2.7.0.0, template-haskell-2.6.0.0, template-haskell-2.5.0.0,
template-haskell-2.4.0.1, template-haskell-2.4.0.0, template-haskell-2.3.0.1,
template-haskell-2.3.0.0, template-haskell-2.2.0.0 (constraint from
non-upgradeable package requires installed instance)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: papillon, template-haskell