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 (global
constraint requires ==1.1.3)
trying: haskell-src-exts-1.1.3
trying: base-4.8.1.0/installed-4f7... (dependency of haskell-src-exts-1.1.3)
rejecting: haskell-src-exts-1.1.3:+base4 (conflict:
base==4.8.1.0/installed-4f7..., haskell-src-exts-1.1.3:base4 => base>=4 && <0)
rejecting: haskell-src-exts-1.1.3:-base4 (conflict:
base==4.8.1.0/installed-4f7..., haskell-src-exts-1.1.3:base4 => base>=3 && <0)
Dependency tree exhaustively searched.