Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: happy-meta (user goal)
rejecting: happy-meta-0.2.0.8, happy-meta-0.2.0.7, happy-meta-0.2.0.6,
happy-meta-0.2.0.5, happy-meta-0.2.0.4, happy-meta-0.2.0.3,
happy-meta-0.2.0.2, happy-meta-0.2.0.1 (constraint from user target requires
==0.2)
trying: happy-meta-0.2
trying: haskell-src-meta-0.7.0 (dependency of happy-meta-0.2)
next goal: template-haskell (dependency of happy-meta-0.2)
rejecting: template-haskell-2.11.0.0/installed-2.1...,
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 (conflict: happy-meta =>
template-haskell>=2.4 && <2.5)
rejecting: template-haskell-2.4.0.1, template-haskell-2.4.0.0 (conflict:
haskell-src-meta => template-haskell>=2.7 && <2.12)
rejecting: template-haskell-2.3.0.1, template-haskell-2.3.0.0,
template-haskell-2.2.0.0 (conflict: happy-meta => template-haskell>=2.4 &&
<2.5)
Dependency tree exhaustively searched.