build fails with --enable-tests

[ababkin]

Tried to fix this by adding either >= 4.4.1 to cabal file and import Control.Monad.Trans.Either (EitherT) but got bogged down on catchT, which i cannot find which package it came from anywhere by googling. Please consider specifying the precise imports in parentheses going forward so it is easy to track down what was imported from where. Bulk importing may seem like saving time but is actually a tech debt, which my experience proves.

1 of 2] Compiling Utils            ( tests/Utils.hs, dist/dist-sandbox-2352247e/build/SNS-tests/SNS-tests-tmp/Utils.o )

tests/Utils.hs:75:30:
    Not in scope: type constructor or class ‘EitherT’
    Perhaps you meant one of these:
      ‘Either’ (imported from Prelude),
      ‘EitherR’ (imported from Control.Error)

tests/Utils.hs:81:31:
    Not in scope: type constructor or class ‘EitherT’
    Perhaps you meant one of these:
      ‘Either’ (imported from Prelude),
      ‘EitherR’ (imported from Control.Error)

tests/Utils.hs:81:53:
    Not in scope: type constructor or class ‘EitherT’
    Perhaps you meant one of these:
      ‘Either’ (imported from Prelude),
      ‘EitherR’ (imported from Control.Error)

tests/Utils.hs:86:25:
    Not in scope: ‘catchT’
    Perhaps you meant ‘catchE’ (imported from Control.Error)

tests/Utils.hs:96:11:
    Not in scope: type constructor or class ‘EitherT’
    Perhaps you meant one of these:
      ‘Either’ (imported from Prelude),
      ‘EitherR’ (imported from Control.Error)

tests/Utils.hs:99:12:
    Not in scope: ‘runEitherT’
    Perhaps you meant ‘runEitherR’ (imported from Control.Error)

tests/Utils.hs:106:8:
    Not in scope: type constructor or class ‘EitherT’
    Perhaps you meant one of these:
      ‘Either’ (imported from Prelude),
      ‘EitherR’ (imported from Control.Error)

tests/Utils.hs:112:8:
    Not in scope: type constructor or class ‘EitherT’
    Perhaps you meant one of these:
      ‘Either’ (imported from Prelude),
      ‘EitherR’ (imported from Control.Error)

tests/Utils.hs:120:14:
    Not in scope: type constructor or class ‘EitherT’
    Perhaps you meant one of these:
      ‘Either’ (imported from Prelude),
      ‘EitherR’ (imported from Control.Error)

tests/Utils.hs:128:19:
    Not in scope: type constructor or class ‘EitherT’
    Perhaps you meant one of these:
      ‘Either’ (imported from Prelude),
      ‘EitherR’ (imported from Control.Error)
cabal: Error: some packages failed to install:
aws-sns-0.1 failed during the building phase. The exception was:
ExitFailure 1