Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: data-lens-template (user goal)
rejecting: data-lens-template-2.1.9, 2.1.8, 2.1.7, 2.1.6, 2.1.5, 2.1.4, 2.1.3,
2.1.2, 2.1.1.1, 2.1.1 (global constraint requires ==2.1.0)
trying: data-lens-template-2.1.0
trying: base-4.8.1.0/installed-4f7... (dependency of data-lens-template-2.1.0)
next goal: template-haskell (dependency of data-lens-template-2.1.0)
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: data-lens-template =>
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:
data-lens-template => template-haskell>=2.4 && <2.6)
Dependency tree exhaustively searched.