Resolving dependencies...
Configuring utf8-string-1.0.1.1...
Configuring util-0.1.7.0...
Building utf8-string-1.0.1.1...
Building util-0.1.7.0...
Failed to install util-0.1.7.0
Build log ( /home/builder/.cabal/logs/ghc-8.2.2/util-0.1.7.0-LmPJ42AnzKYEouhvgY601A.log ):
cabal: Entering directory '/tmp/cabal-tmp-2482/util-0.1.7.0'
Configuring util-0.1.7.0...
Preprocessing library for util-0.1.7.0..
Building library for util-0.1.7.0..
[1 of 2] Compiling Util             ( Util.hs, dist/build/Util.o )

Util.hs:136:28: error:
    • Could not deduce (Semigroup b) arising from a use of ‘<>’
      from the context: (Applicative p, Monoid b, Foldable f)
        bound by the type signature for:
                   foldMapA :: forall (p :: * -> *) b (f :: * -> *) a.
                               (Applicative p, Monoid b, Foldable f) =>
                               (a -> p b) -> f a -> p b
        at Util.hs:135:1-77
      Possible fix:
        add (Semigroup b) to the context of
          the type signature for:
            foldMapA :: forall (p :: * -> *) b (f :: * -> *) a.
                        (Applicative p, Monoid b, Foldable f) =>
                        (a -> p b) -> f a -> p b
    • In the first argument of ‘liftA2’, namely ‘(<>)’
      In the first argument of ‘(.)’, namely ‘liftA2 (<>)’
      In the first argument of ‘foldr’, namely ‘(liftA2 (<>) . f)’
    |
136 | foldMapA f = foldr (liftA2 (<>) . f) (pure mempty)
    |                            ^^^^
cabal: Leaving directory '/tmp/cabal-tmp-2482/util-0.1.7.0'
Installed utf8-string-1.0.1.1
cabal: Error: some packages failed to install:
txt-0.0.2.0-CQslGIrO56W7JDhR569jwY depends on txt-0.0.2.0 which failed to
install.
util-0.1.7.0-LmPJ42AnzKYEouhvgY601A failed during the building phase. The
exception was:
ExitFailure 1