Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: haskell-src-exts (user goal)
rejecting: haskell-src-exts-1.19.0, haskell-src-exts-1.18.2,
haskell-src-exts-1.18.1, haskell-src-exts-1.18.0, haskell-src-exts-1.17.1,
haskell-src-exts-1.17.0, haskell-src-exts-1.16.0.1, haskell-src-exts-1.16.0,
haskell-src-exts-1.15.0.1, haskell-src-exts-1.15.0, haskell-src-exts-1.14.0.1,
haskell-src-exts-1.14.0, haskell-src-exts-1.13.5, haskell-src-exts-1.13.4,
haskell-src-exts-1.13.3, haskell-src-exts-1.13.2, haskell-src-exts-1.13.1,
haskell-src-exts-1.13.0, haskell-src-exts-1.12.0, haskell-src-exts-1.11.1,
haskell-src-exts-1.10.2, haskell-src-exts-1.10.1, haskell-src-exts-1.10.0,
haskell-src-exts-1.9.6, haskell-src-exts-1.9.5, haskell-src-exts-1.9.4,
haskell-src-exts-1.9.3, haskell-src-exts-1.9.0, haskell-src-exts-1.8.2,
haskell-src-exts-1.8.1, haskell-src-exts-1.8.0, haskell-src-exts-1.7.2,
haskell-src-exts-1.7.1, haskell-src-exts-1.7.0, haskell-src-exts-1.6.1,
haskell-src-exts-1.6.0, haskell-src-exts-1.5.3, haskell-src-exts-1.5.2,
haskell-src-exts-1.5.1, haskell-src-exts-1.5.0, haskell-src-exts-1.4.0,
haskell-src-exts-1.3.5, haskell-src-exts-1.3.4, haskell-src-exts-1.3.3,
haskell-src-exts-1.3.2, haskell-src-exts-1.3.1, haskell-src-exts-1.3.0,
haskell-src-exts-1.2.0, haskell-src-exts-1.1.4, haskell-src-exts-1.1.3.1,
haskell-src-exts-1.1.3, haskell-src-exts-1.1.1, haskell-src-exts-1.1.0,
haskell-src-exts-1.0.1, haskell-src-exts-1.0.0, haskell-src-exts-0.5.7,
haskell-src-exts-0.5.6, haskell-src-exts-0.5.5, haskell-src-exts-0.5.4,
haskell-src-exts-0.5.3, haskell-src-exts-0.5.2, haskell-src-exts-0.4.8,
haskell-src-exts-0.4.6, haskell-src-exts-0.4.5, haskell-src-exts-0.4.4.1,
haskell-src-exts-0.4.4, haskell-src-exts-0.4.3.1, haskell-src-exts-0.4.3,
haskell-src-exts-0.4.2, haskell-src-exts-0.4.1, haskell-src-exts-0.3.12,
haskell-src-exts-0.3.11, haskell-src-exts-0.3.10, haskell-src-exts-0.3.9,
haskell-src-exts-0.3.7, haskell-src-exts-0.3.5 (constraint from user target
requires ==0.3.4)
trying: haskell-src-exts-0.3.4
next goal: base (dependency of haskell-src-exts-0.3.4)
rejecting: base-4.9.0.0/installed-4.9... (conflict: haskell-src-exts =>
base>=3 && <4.3 || <3)
rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
Dependency tree exhaustively searched.