Resolving dependencies...
cabal: Could not resolve dependencies:
trying: base-4.9.1.0/installed-4.9... (dependency of
haskell-src-exts-observe-0.1.0)
trying: Hoed-0.3.6 (dependency of haskell-src-exts-observe-0.1.0)
next goal: threepenny-gui (dependency of Hoed-0.3.6)
rejecting: threepenny-gui-0.8.0.1, threepenny-gui-0.8.0.0,
threepenny-gui-0.7.0.2, threepenny-gui-0.7.0.1, threepenny-gui-0.7.0.0,
threepenny-gui-0.6.0.6 (conflict: Hoed => threepenny-gui==0.6.0.5)
rejecting: threepenny-gui-0.6.0.5 (conflict: base==4.9.1.0/installed-4.9...,
threepenny-gui => base>=4.6 && <4.9)
rejecting: threepenny-gui-0.6.0.4, threepenny-gui-0.6.0.3,
threepenny-gui-0.6.0.2, threepenny-gui-0.6.0.1, threepenny-gui-0.5.0.0,
threepenny-gui-0.4.2.0, threepenny-gui-0.4.1.0, threepenny-gui-0.4.0.2,
threepenny-gui-0.4.0.1, threepenny-gui-0.4.0.0, threepenny-gui-0.3.0.1,
threepenny-gui-0.3.0.0, threepenny-gui-0.2.0.1, threepenny-gui-0.2.0.0,
threepenny-gui-0.1.0.1, threepenny-gui-0.1.0.0 (conflict: Hoed =>
threepenny-gui==0.6.0.5)
Backjump limit reached (currently 2000, change with --max-backjumps or try to
run with --reorder-goals).