Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: pandoc (user goal)
rejecting: pandoc-1.19, pandoc-1.18, pandoc-1.17.2, pandoc-1.17.1,
pandoc-1.17.0.3, pandoc-1.17.0.2, pandoc-1.17.0.1, pandoc-1.17,
pandoc-1.16.0.2, pandoc-1.16.0.1, pandoc-1.16, pandoc-1.15.2.1, pandoc-1.15.2,
pandoc-1.15.1.1, pandoc-1.15.1, pandoc-1.15.0.6, pandoc-1.15.0.5,
pandoc-1.15.0.4 (constraint from user target requires ==1.15.0.3)
trying: pandoc-1.15.0.3
trying: base-4.9.0.0/installed-4.9... (dependency of pandoc-1.15.0.3)
next goal: cmark (dependency of pandoc-1.15.0.3)
rejecting: cmark-0.5.4, cmark-0.5.3.1, cmark-0.5.2.1, cmark-0.5.2,
cmark-0.5.1, cmark-0.5.0, cmark-0.4.1, cmark-0.4.0.1 (conflict: pandoc =>
cmark>=0.3.4 && <0.4)
rejecting: cmark-0.3.4 (conflict: base==4.9.0.0/installed-4.9..., cmark =>
base>=4.5 && <4.9)
rejecting: cmark-0.3.3.1, cmark-0.3.3, cmark-0.3.2, cmark-0.3.1,
cmark-0.3.0.1, cmark-0.3, cmark-0.2.0.2, cmark-0.2.0.1, cmark-0.2,
cmark-0.1.0.1, cmark-0.1.0.0, cmark-0.5.3 (conflict: pandoc => cmark>=0.3.4 &&
<0.4)
rejecting: cmark-0.3.5 (conflict: base==4.9.0.0/installed-4.9..., cmark =>
base>=4.5 && <4.9)
Dependency tree exhaustively searched.