Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: exception-hierarchy (user goal)
rejecting: exception-hierarchy-0.0.0.2 (constraint from user target requires
==0.0.0.1)
trying: exception-hierarchy-0.0.0.1
trying: base-4.9.0.0/installed-4.9... (dependency of
exception-hierarchy-0.0.0.1)
next goal: template-haskell (dependency of exception-hierarchy-0.0.0.1)
rejecting: template-haskell-2.11.0.0/installed-2.1...,
template-haskell-2.11.0.0, template-haskell-2.10.0.0 (conflict:
exception-hierarchy => template-haskell==2.9.*)
rejecting: template-haskell-2.9.0.0 (conflict: base==4.9.0.0/installed-4.9...,
template-haskell => base==4.7.*)
rejecting: 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 (conflict: exception-hierarchy =>
template-haskell==2.9.*)
Dependency tree exhaustively searched.