Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: fst (user goal)
rejecting: fst-0.10.0.1, fst-0.10.0.0, fst-0.9.0.1 (constraint from user
target requires ==0.9)
trying: fst-0.9
trying: base-4.9.0.0/installed-4.9... (dependency of fst-0.9)
trying: array-0.5.1.1/installed-0.5... (dependency of fst-0.9)
next goal: haskell98 (dependency of fst-0.9)
rejecting: haskell98-2.0.0.3 (conflict: base==4.9.0.0/installed-4.9...,
haskell98 => base>=4.7 && <4.8)
rejecting: haskell98-2.0.0.2 (conflict: base==4.9.0.0/installed-4.9...,
haskell98 => base==4.6.*)
rejecting: haskell98-2.0.0.1 (conflict: array==0.5.1.1/installed-0.5...,
haskell98 => array>=0.3 && <0.5)
rejecting: haskell98-2.0.0.0 (conflict: array==0.5.1.1/installed-0.5...,
haskell98 => array>=0.3 && <0.4)
rejecting: haskell98-1.1.0.1, haskell98-1.1.0.0, haskell98-1.0.1.1 (conflict:
base==4.9.0.0/installed-4.9..., haskell98 => base>=3 && <4.6)
rejecting: haskell98-1.0.1.0 (conflict: base==4.9.0.0/installed-4.9...,
haskell98 => base<4.6)
rejecting: haskell98-1.0 (conflict: base==4.9.0.0/installed-4.9..., haskell98
=> base<4.3)
Dependency tree exhaustively searched.