Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: wai-websockets (user goal)
rejecting: wai-websockets-3.0.0.5, 3.0.0.4, 3.0.0.3, 3.0.0.2, 3.0.0.1, 3.0.0,
2.1.0.2, 2.1.0.1, 2.1.0, 2.0.0.1, 2.0.0, 1.3.2.1, 1.3.2.0, 1.3.1.3, 1.3.1.2,
1.3.1.1, 1.3.1, 1.3.0.1, 1.3.0, 1.2.0.3, 1.2.0.2 (global constraint requires
==1.2.0.1)
trying: wai-websockets-1.2.0.1
trying: file-embed-0.0.8.2 (dependency of wai-websockets-1.2.0.1)
trying: directory-1.2.1.0/installed-4c4... (dependency of file-embed-0.0.8.2)
next goal: unix (dependency of directory-1.2.1.0/installed-4c4...)
rejecting: unix-2.7.0.1/installed-0d8... (conflict: unix =>
bytestring==0.10.4.0/installed-9f4..., wai-websockets => bytestring>=0.9.1.4
&& <0.10)
rejecting: unix-2.7.1.0, 2.7.0.1, 2.7.0.0, 2.6.0.1, 2.6.0.0, 2.5.1.1, 2.5.1.0,
2.5.0.0, 2.4.2.0, 2.4.1.0, 2.4.0.2, 2.4.0.1, 2.4.0.0, 2.3.2.0, 2.3.1.0,
2.3.0.0, 2.2.0.0, 2.0 (conflict: directory => unix==2.7.0.1/installed-0d8...)
Backjump limit reached (change with --max-backjumps).