Resolving dependencies...
Configuring mtl-2.2.1...
Configuring text-1.2.2.1...
Building mtl-2.2.1...
Building text-1.2.2.1...
Configuring utf8-string-1.0.1.1...
Installed mtl-2.2.1
Building utf8-string-1.0.1.1...
Configuring zlib-0.6.1.2...
Installed utf8-string-1.0.1.1
Building zlib-0.6.1.2...
Installed zlib-0.6.1.2
Installed text-1.2.2.1
Configuring parsec-3.1.11...
Building parsec-3.1.11...
Installed parsec-3.1.11
Configuring hpdft-0.1.0.0...
Building hpdft-0.1.0.0...
Failed to install hpdft-0.1.0.0
Build log ( /home/builder/.cabal/logs/hpdft-0.1.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-28675/hpdft-0.1.0.0'
Configuring hpdft-0.1.0.0...
Building hpdft-0.1.0.0...
Preprocessing library hpdft-0.1.0.0...
[1 of 7] Compiling PDF.Definition   ( src/PDF/Definition.hs, dist/build/PDF/Definition.o )
[2 of 7] Compiling PDF.Character    ( src/PDF/Character.hs, dist/build/PDF/Character.o )
[3 of 7] Compiling PDF.Cmap         ( src/PDF/Cmap.hs, dist/build/PDF/Cmap.o )
[4 of 7] Compiling PDF.ContentStream ( src/PDF/ContentStream.hs, dist/build/PDF/ContentStream.o )

src/PDF/ContentStream.hs:29:1: error:
    • Non type-variable argument
        in the constraint: Stream s Data.Functor.Identity.Identity t
      (Use FlexibleContexts to permit this)
    • When checking the inferred type
        parseContentStream :: forall a u s t.
                              Stream s Data.Functor.Identity.Identity t =>
                              Parsec s u a -> u -> s -> Either ParseError a
cabal: Leaving directory '/tmp/cabal-tmp-28675/hpdft-0.1.0.0'
cabal: Error: some packages failed to install:
hpdft-0.1.0.0 failed during the building phase. The exception was:
ExitFailure 1