Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: msgpack (user goal)
rejecting: msgpack-1.0.0, 0.7.2.5, 0.7.1.5, 0.7.1.4, 0.7.1.3, 0.7.1.2,
0.7.1.1, 0.7.1, 0.7.0, 0.6.4, 0.6.3, 0.6.2, 0.6.1.3 (global constraint
requires ==0.6.1.2)
trying: msgpack-0.6.1.2
trying: base-4.8.1.0/installed-4f7... (dependency of msgpack-0.6.1.2)
next goal: template-haskell (dependency of msgpack-0.6.1.2)
rejecting: template-haskell-2.10.0.0/installed-90e..., 2.10.0.0, 2.9.0.0,
2.8.0.0, 2.7.0.0, 2.6.0.0 (conflict: msgpack => template-haskell>=2.4 && <2.6)
rejecting: template-haskell-2.5.0.0 (conflict: base==4.8.1.0/installed-4f7...,
template-haskell => base==4.3.*)
rejecting: template-haskell-2.4.0.1 (conflict: base==4.8.1.0/installed-4f7...,
template-haskell => base==4.2.*)
rejecting: template-haskell-2.4.0.0 (conflict: base==4.8.1.0/installed-4f7...,
template-haskell => base>=3 && <4.3)
rejecting: template-haskell-2.3.0.1, 2.3.0.0, 2.2.0.0 (conflict: msgpack =>
template-haskell>=2.4 && <2.6)
Dependency tree exhaustively searched.