[all reports]
Install 
PlanningFailed 
Docs 
NotTried 
Tests 
NotTried 
Time submitted 
20181203 14:29:15.437064578 UTC

Compiler 
ghc8.6.1 
OS 
linux 
Arch 
x86_64 
Dependencies 

Flags 
none

Build log
[view raw]
Warning: The install command is a part of the legacy v1 style of cabal usage.
Please switch to using either the new project style and the newinstall
command or the legacy v1install alias as newstyle projects will become the
default in the next version of cabalinstall. Please file a bug if you cannot
replicate a working v1 use case with the newstyle commands.
For more information, see: https://wiki.haskell.org/Cabal/NewBuild
Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: imap0.3.0.9 (user goal)
[__1] next goal: base (dependency of imap)
[__1] rejecting: base4.12.0.0/installed4.1... (conflict: imap => base>=4.10
&& <4.12)
[__1] rejecting: base4.12.0.0, base4.11.1.0, base4.11.0.0, base4.10.1.0,
base4.10.0.0, base4.9.1.0, base4.9.0.0, base4.8.2.0, base4.8.1.0,
base4.8.0.0, base4.7.0.2, base4.7.0.1, base4.7.0.0, base4.6.0.1,
base4.6.0.0, base4.5.1.0, base4.5.0.0, base4.4.1.0, base4.4.0.0,
base4.3.1.0, base4.3.0.0, base4.2.0.2, base4.2.0.1, base4.2.0.0,
base4.1.0.0, base4.0.0.0, base3.0.3.2, base3.0.3.1 (constraint from
nonupgradeable package requires installed instance)
[__1] fail (backjumping, conflict set: base, imap)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, imap