Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: pandoc-crossref (user goal)
rejecting: pandoc-crossref-0.2.4.1, pandoc-crossref-0.2.3.0,
pandoc-crossref-0.2.2.1, pandoc-crossref-0.2.1.3, pandoc-crossref-0.2.1.2,
pandoc-crossref-0.2.1.1 (constraint from user target requires ==0.1.6.5)
trying: pandoc-crossref-0.1.6.5
trying: aeson-1.0.2.1 (dependency of yaml-0.8.20)
next goal: pandoc-types (dependency of pandoc-crossref-0.1.6.5)
rejecting: pandoc-types-1.17.0.4, pandoc-types-1.17.0.3,
pandoc-types-1.17.0.2, pandoc-types-1.17.0.1, pandoc-types-1.17 (conflict:
pandoc-crossref => pandoc-types>=1.12.4.1 && <1.17)
trying: pandoc-types-1.16.1.1
trying: syb-0.6 (dependency of pandoc-types-1.16.1.1)
next goal: pandoc (dependency of pandoc-crossref-0.1.6.5)
rejecting: 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 (conflict: pandoc-crossref =>
pandoc>=1.13 && <1.17)
rejecting: pandoc-1.16.0.2, pandoc-1.16.0.1, pandoc-1.16 (conflict:
aeson==1.0.2.1, 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
(conflict: pandoc-types==1.16.1.1, pandoc => pandoc-types>=1.12.4 && <1.13)
rejecting: 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 (conflict: syb==0.6, pandoc => syb>=0.1 &&
<0.6)
rejecting: pandoc-1.13.2.1, pandoc-1.13.2, pandoc-1.13.1, pandoc-1.13.0.1,
pandoc-1.13 (conflict: syb==0.6, pandoc => syb>=0.1 && <0.5)
rejecting: 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 (conflict: pandoc-crossref => pandoc>=1.13 && <1.17)
rejecting: pandoc-1.15.0.1, pandoc-1.15, pandoc-1.14.0.4, pandoc-1.14.0.3
(conflict: syb==0.6, pandoc => syb>=0.1 && <0.6)
rejecting: pandoc-1.14.0.2, pandoc-1.14.0.1, pandoc-1.14 (conflict: syb==0.6,
pandoc => syb>=0.1 && <0.5)
Backjump limit reached (currently 2000, change with --max-backjumps or try to
run with --reorder-goals).