Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: haskell-src-exts (user goal)
rejecting: haskell-src-exts-1.16.0.1, 1.16.0, 1.15.0.1, 1.15.0, 1.14.0.1,
1.14.0, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0, 1.12.0, 1.11.1,
1.10.2, 1.10.1, 1.10.0, 1.9.6, 1.9.5, 1.9.4, 1.9.3, 1.9.0, 1.8.2, 1.8.1,
1.8.0, 1.7.2, 1.7.1, 1.7.0, 1.6.1, 1.6.0, 1.5.3, 1.5.2, 1.5.1, 1.5.0, 1.4.0,
1.3.5, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0, 1.2.0, 1.1.4, 1.1.3.1, 1.1.3, 1.1.1,
1.1.0, 1.0.1, 1.0.0, 0.5.7, 0.5.6, 0.5.5, 0.5.4, 0.5.3, 0.5.2, 0.4.8, 0.4.6,
0.4.5, 0.4.4.1, 0.4.4, 0.4.3.1 (global constraint requires ==0.4.3)
trying: haskell-src-exts-0.4.3
next goal: base (dependency of haskell-src-exts-0.4.3)
rejecting: base-4.8.1.0/installed-4f7... (conflict: haskell-src-exts =>
base>=4 && <4.8)
rejecting: base-4.8.1.0, 4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0,
4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1,
4.2.0.0, 4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires
installed instance)
Dependency tree exhaustively searched.