Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: hpaco (user goal)
rejecting: hpaco-0.28.0.5, 0.28.0.4, 0.28.0.3, 0.28.0.2, 0.28.0.1, 0.28.0.0,
0.26.0.0 (global constraint requires ==0.25.2.0)
trying: hpaco-0.25.2.0
trying: base-4.8.1.0/installed-4f7... (dependency of hpaco-0.25.2.0)
next goal: hpaco-lib (dependency of hpaco-0.25.2.0)
rejecting: hpaco-lib-0.28.0.5, 0.28.0.4, 0.28.0.3, 0.28.0.2, 0.28.0.1,
0.28.0.0, 0.26.0.0 (conflict: hpaco => hpaco-lib==0.25.2.0)
trying: hpaco-lib-0.25.2.0
next goal: aeson (dependency of hpaco-lib-0.25.2.0)
rejecting: aeson-0.10.0.0, 0.9.0.1, 0.9.0.0, 0.8.1.1, 0.8.1.0, 0.8.0.2,
0.7.0.6, 0.7.0.4 (conflict: hpaco-lib => aeson==0.6.*)
trying: aeson-0.6.2.1
next goal: template-haskell (dependency of aeson-0.6.2.1)
rejecting: template-haskell-2.10.0.0/installed-90e..., 2.10.0.0 (conflict:
aeson => template-haskell>=2.4 && <2.10)
rejecting: template-haskell-2.9.0.0 (conflict: base==4.8.1.0/installed-4f7...,
template-haskell => base==4.7.*)
rejecting: template-haskell-2.8.0.0 (conflict: base==4.8.1.0/installed-4f7...,
template-haskell => base==4.6.*)
rejecting: template-haskell-2.7.0.0 (conflict: base==4.8.1.0/installed-4f7...,
template-haskell => base==4.5.*)
rejecting: template-haskell-2.6.0.0 (conflict: base==4.8.1.0/installed-4f7...,
template-haskell => base==4.4.*)
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: aeson =>
template-haskell>=2.4 && <2.10)
Dependency tree exhaustively searched.