Resolving dependencies...
Configuring erf-2.0.0.0...
Configuring primitive-0.6.4.0...
Building erf-2.0.0.0...
Building primitive-0.6.4.0...
Installed erf-2.0.0.0
Configuring random-1.1...
Building random-1.1...
Installed random-1.1
Installed primitive-0.6.4.0
Configuring tf-random-0.5...
Building tf-random-0.5...
Installed tf-random-0.5
Configuring QuickCheck-2.12.6...
Building QuickCheck-2.12.6...
Failed to install QuickCheck-2.12.6
Build log ( /home/builder/.cabal/logs/ghc-8.4.3/QuickCheck-2.12.6-BJLXOWJo4NJ7rthXWdy19x.log ):
cabal: Entering directory '/tmp/cabal-tmp-27210/QuickCheck-2.12.6'
Configuring QuickCheck-2.12.6...
Preprocessing library for QuickCheck-2.12.6..
Building library for QuickCheck-2.12.6..
[ 1 of 16] Compiling Test.QuickCheck.Exception ( Test/QuickCheck/Exception.hs, dist/build/Test/QuickCheck/Exception.o )
[ 2 of 16] Compiling Test.QuickCheck.Random ( Test/QuickCheck/Random.hs, dist/build/Test/QuickCheck/Random.o )
[ 3 of 16] Compiling Test.QuickCheck.Gen ( Test/QuickCheck/Gen.hs, dist/build/Test/QuickCheck/Gen.o )
[ 4 of 16] Compiling Test.QuickCheck.Gen.Unsafe ( Test/QuickCheck/Gen/Unsafe.hs, dist/build/Test/QuickCheck/Gen/Unsafe.o )
[ 5 of 16] Compiling Test.QuickCheck.Arbitrary ( Test/QuickCheck/Arbitrary.hs, dist/build/Test/QuickCheck/Arbitrary.o )
[ 6 of 16] Compiling Test.QuickCheck.Poly ( Test/QuickCheck/Poly.hs, dist/build/Test/QuickCheck/Poly.o )
[ 7 of 16] Compiling Test.QuickCheck.Modifiers ( Test/QuickCheck/Modifiers.hs, dist/build/Test/QuickCheck/Modifiers.o )

Test/QuickCheck/Modifiers.hs:62:5: error:
    Not in scope: type constructor or class ‘Smaller’
    Perhaps you meant ‘Small’ (line 351)
   |
62 |   , Smaller(..)
   |     ^^^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-27210/QuickCheck-2.12.6'
cabal: Error: some packages failed to install:
QuickCheck-2.12.6-BJLXOWJo4NJ7rthXWdy19x failed during the building phase. The
exception was:
ExitFailure 1