Resolving dependencies...
Downloading 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.Error   ( src/Language/Error.hs, dist/dist-sandbox-9df84abc/build/Language/Error.o )
[ 2 of 10] Compiling Language.Primitives.IoAble ( src/Language/Primitives/IoAble.hs, dist/dist-sandbox-9df84abc/build/Language/Primitives/IoAble.o )
[ 3 of 10] Compiling Language.Primitives.Io ( src/Language/Primitives/Io.hs, dist/dist-sandbox-9df84abc/build/Language/Primitives/Io.o )
[ 4 of 10] Compiling Language.Primitives.Map ( src/Language/Primitives/Map.hs, dist/dist-sandbox-9df84abc/build/Language/Primitives/Map.o )
[ 5 of 10] Compiling Language.Ast     ( src/Language/Ast.hs, dist/dist-sandbox-9df84abc/build/Language/Ast.o )
[ 6 of 10] Compiling Language.Parser  ( src/Language/Parser.hs, dist/dist-sandbox-9df84abc/build/Language/Parser.o )
[ 7 of 10] Compiling Language.Primitives ( src/Language/Primitives.hs, dist/dist-sandbox-9df84abc/build/Language/Primitives.o )
[ 8 of 10] Compiling Language.Desugar ( src/Language/Desugar.hs, dist/dist-sandbox-9df84abc/build/Language/Desugar.o )
[ 9 of 10] Compiling Language.Executor ( src/Language/Executor.hs, dist/dist-sandbox-9df84abc/build/Language/Executor.o )
[10 of 10] Compiling Mappy            ( src/Mappy.hs, dist/dist-sandbox-9df84abc/build/Mappy.o )
In-place registering mappy-0.1.0.0...
Preprocessing executable 'mappy' for mappy-0.1.0.0...

app/Main.hs:4:8:
    Could not find module ‘Repl’
    Use -v to see a list of the files searched for.
Failed to install 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