Resolving dependencies...
Starting     ghc-exactprint-1.1.0
Building     ghc-exactprint-1.1.0
Failed to install ghc-exactprint-1.1.0
Build log ( /home/builder/.cabal/logs/ghc-8.10.2/ghc-exactprint-1.1.0-GTizVAHZEbf2zTcmWNAG3o.log ):
cabal: Entering directory '/tmp/cabal-tmp-5028/ghc-exactprint-1.1.0'
Configuring ghc-exactprint-1.1.0...
Building ghc-exactprint-1.1.0...
Warning: No documentation was generated as this package does not contain a
library. Perhaps you want to use the --executables, --tests, --benchmarks or
--foreign-libraries flags.
cabal: No executables and no library found. Nothing to do.

cabal: Leaving directory '/tmp/cabal-tmp-5028/ghc-exactprint-1.1.0'
cabal: Error: some packages failed to install:
ghc-exactprint-1.1.0-GTizVAHZEbf2zTcmWNAG3o failed during the final install
step. The exception was:
ExitFailure 1