Resolving dependencies...
Configuring either-both-0.1.0.0...
Building either-both-0.1.0.0...
Failed to install either-both-0.1.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.2.2/either-both-0.1.0.0-EvVgxsu0osi5y0gt0h07o4.log ):
cabal: Entering directory '/tmp/cabal-tmp-5260/either-both-0.1.0.0'
Configuring either-both-0.1.0.0...
Preprocessing library for either-both-0.1.0.0..
Building library for either-both-0.1.0.0..
[1 of 1] Compiling Data.Either.Both ( Data/Either/Both.hs, dist/build/Data/Either/Both.o )

Data/Either/Both.hs:37:40: error:
    Not in scope: type constructor or class ‘Semigroup’
   |
37 | instance (Semigroup a, Semigroup b) => Semigroup (Either' a b) where
   |                                        ^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-5260/either-both-0.1.0.0'
cabal: Error: some packages failed to install:
either-both-0.1.0.0-EvVgxsu0osi5y0gt0h07o4 failed during the building phase.
The exception was:
ExitFailure 1