Resolving dependencies...
cabal: Could not resolve dependencies:
trying: yesod-markdown-0.11.1 (user goal)
trying: aeson-0.11.2.0 (dependency of pandoc-types-1.16.1)
trying: data-default-0.7.0 (dependency of yesod-form-1.4.7.1)
next goal: pandoc (dependency of yesod-markdown-0.11.1)
rejecting: pandoc-1.17.0.3 (conflict: data-default==0.7.0, pandoc =>
data-default>=0.4 && <0.7)
rejecting: pandoc-1.17.0.2, pandoc-1.17.0.1, pandoc-1.17 (conflict:
data-default==0.7.0, pandoc => data-default>=0.4 && <0.6)
rejecting: pandoc-1.16.0.2, pandoc-1.16.0.1, pandoc-1.16 (conflict:
aeson==0.11.2.0, pandoc => aeson>=0.7 && <0.11)
rejecting: 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, pandoc-1.15.0.3,
pandoc-1.15.0.2, pandoc-1.14.1, pandoc-1.13.2.1, pandoc-1.13.2, pandoc-1.13.1,
pandoc-1.13.0.1, pandoc-1.13, pandoc-1.12.4.2, pandoc-1.12.4, pandoc-1.12.3.3,
pandoc-1.12.3.2, pandoc-1.12.3.1, pandoc-1.12.3, pandoc-1.12.2.1,
pandoc-1.12.2, pandoc-1.12.1, pandoc-1.12.0.2, pandoc-1.12.0.1, pandoc-1.12,
pandoc-1.11.1, pandoc-1.11, pandoc-1.10.1, pandoc-1.10.0.5, pandoc-1.10.0.4,
pandoc-1.10.0.3, pandoc-1.10.0.2, pandoc-1.10.0.1, pandoc-1.10,
pandoc-1.9.4.5, pandoc-1.9.4.4, pandoc-1.9.4.3, pandoc-1.9.4.2,
pandoc-1.9.4.1, pandoc-1.9.4, pandoc-1.9.3, pandoc-1.9.2, pandoc-1.9.1.2,
pandoc-1.9.1.1, pandoc-1.9.1, pandoc-1.9.0.5, pandoc-1.9.0.4, pandoc-1.9.0.3,
pandoc-1.9.0.2, pandoc-1.9, pandoc-1.8.2.1, pandoc-1.8.2, pandoc-1.8.1.2,
pandoc-1.8.1.1, pandoc-1.8.1, pandoc-1.8.0.3, pandoc-1.8.0.2, pandoc-1.8.0.1,
pandoc-1.8, pandoc-1.6.0.1, pandoc-1.6, pandoc-1.5.1.1, pandoc-1.5.1,
pandoc-1.5.0.1, pandoc-1.5, pandoc-1.4, pandoc-1.3, pandoc-1.2.1, pandoc-1.2,
pandoc-1.1, pandoc-1.0.0.1, pandoc-1.0, pandoc-0.46, pandoc-0.45, pandoc-0.44,
pandoc-0.43, pandoc-0.42, pandoc-0.41, pandoc-0.4, pandoc-1.15.0.1,
pandoc-1.15, pandoc-1.14.0.4, pandoc-1.14.0.3, pandoc-1.14.0.2,
pandoc-1.14.0.1, pandoc-1.14 (conflict: yesod-markdown => pandoc>=1.16 &&
<1.18)
Backjump limit reached (currently 2000, change with --max-backjumps or try to
run with --reorder-goals).