Resolving dependencies...
cabal: Could not resolve dependencies:
trying: base-4.9.0.0/installed-4.9... (dependency of yst-0.5.1)
next goal: pandoc (dependency of yst-0.5.1)
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: yst => pandoc>=1.10
&& <1.17)
trying: pandoc-1.16.0.2
next goal: haddock-library (dependency of pandoc-1.16.0.2)
rejecting: haddock-library-1.4.2, haddock-library-1.4.1 (conflict: pandoc =>
haddock-library>=1.1 && <1.3)
rejecting: haddock-library-1.2.1, haddock-library-1.2.0 (conflict:
base==4.9.0.0/installed-4.9..., haddock-library => base>=4.5 && <4.9)
rejecting: haddock-library-1.1.1 (conflict: base==4.9.0.0/installed-4.9...,
haddock-library => base>=4.3 && <4.8)
rejecting: haddock-library-1.1.0 (conflict: base==4.9.0.0/installed-4.9...,
haddock-library => base>=4.5 && <4.8)
rejecting: haddock-library-1.0.1, haddock-library-1.0.0 (conflict: pandoc =>
haddock-library>=1.1 && <1.3)
Backjump limit reached (currently 2000, change with --max-backjumps or try to
run with --reorder-goals).