Resolving dependencies...
Configuring mtl-2.2.1...
Configuring text-1.2.2.1...
Building mtl-2.2.1...
Building text-1.2.2.1...
Installed mtl-2.2.1
Installed text-1.2.2.1
Configuring parsec-3.1.11...
Building parsec-3.1.11...
Installed parsec-3.1.11
Downloading mappy-0.1.0.0...
Configuring mappy-0.1.0.0...
Building mappy-0.1.0.0...
Failed to install mappy-0.1.0.0
Build log ( /home/builder/.cabal/logs/mappy-0.1.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-12986/mappy-0.1.0.0'
Configuring mappy-0.1.0.0...
Building mappy-0.1.0.0...
Preprocessing library mappy-0.1.0.0...
[ 1 of 10] Compiling Language.Primitives.IoAble ( src/Language/Primitives/IoAble.hs, dist/build/Language/Primitives/IoAble.o )
[ 2 of 10] Compiling Language.Primitives.Io ( src/Language/Primitives/Io.hs, dist/build/Language/Primitives/Io.o )
[ 3 of 10] Compiling Language.Error   ( src/Language/Error.hs, dist/build/Language/Error.o )
[ 4 of 10] Compiling Language.Primitives.Map ( src/Language/Primitives/Map.hs, dist/build/Language/Primitives/Map.o )
[ 5 of 10] Compiling Language.Ast     ( src/Language/Ast.hs, dist/build/Language/Ast.o )
[ 6 of 10] Compiling Language.Desugar ( src/Language/Desugar.hs, dist/build/Language/Desugar.o )
[ 7 of 10] Compiling Language.Parser  ( src/Language/Parser.hs, dist/build/Language/Parser.o )
[ 8 of 10] Compiling Language.Primitives ( src/Language/Primitives.hs, dist/build/Language/Primitives.o )
[ 9 of 10] Compiling Language.Executor ( src/Language/Executor.hs, dist/build/Language/Executor.o )
[10 of 10] Compiling Mappy            ( src/Mappy.hs, dist/build/Mappy.o )
Preprocessing executable 'mappy' for mappy-0.1.0.0...
[1 of 1] Compiling Main             ( app/Main.hs, dist/build/mappy/mappy-tmp/Main.o )

app/Main.hs:4:1: error:
    Failed to load interface for ‘Repl’
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-12986/mappy-0.1.0.0'
cabal: Error: some packages failed to install:
mappy-0.1.0.0 failed during the building phase. The exception was:
ExitFailure 1