Resolving dependencies... Configuring Boolean-0.2.3... Configuring NumInstances-1.4... Building NumInstances-1.4... Building Boolean-0.2.3... Installed Boolean-0.2.3 Configuring applicative-numbers-0.1.3... Building applicative-numbers-0.1.3... Configuring base-compat-0.9.1... Installed NumInstances-1.4 Building base-compat-0.9.1... Configuring data-default-class-0.1.2.0... Installed applicative-numbers-0.1.3 Building data-default-class-0.1.2.0... Configuring dlist-0.8.0.2... Installed base-compat-0.9.1 Configuring monadplus-1.4.2... Installed data-default-class-0.1.2.0 Building dlist-0.8.0.2... Building monadplus-1.4.2... Configuring base-orphans-0.5.4... Installed monadplus-1.4.2 Building base-orphans-0.5.4... Configuring mtl-2.2.1... Installed dlist-0.8.0.2 Building mtl-2.2.1... Configuring nats-1.1.1... Installed base-orphans-0.5.4 Building nats-1.1.1... Configuring newtype-0.2... Installed nats-1.1.1 Building newtype-0.2... Configuring newtype-generics-0.5... Installed newtype-0.2 Building newtype-generics-0.5... Configuring random-1.1... Installed mtl-2.2.1 Building random-1.1... Configuring reverse-apply-2.0.1... Installed newtype-generics-0.5 Building reverse-apply-2.0.1... Configuring primitive-0.6.1.0... Installed reverse-apply-2.0.1 Building primitive-0.6.1.0... Configuring old-locale-1.0.0.7... Installed random-1.1 Building old-locale-1.0.0.7... Configuring stm-2.4.4.1... Installed old-locale-1.0.0.7 Building stm-2.4.4.1... Configuring semigroups-0.18.2... Installed primitive-0.6.1.0 Building semigroups-0.18.2... Configuring time-locale-compat-0.1.1.3... Installed stm-2.4.4.1 Configuring text-1.2.2.1... Installed semigroups-0.18.2 Building time-locale-compat-0.1.1.3... Building text-1.2.2.1... Configuring transformers-compat-0.5.1.4... Installed time-locale-compat-0.1.1.3 Building transformers-compat-0.5.1.4... Configuring ty-0.1.7... Installed transformers-compat-0.5.1.4 Building ty-0.1.7... Installed ty-0.1.7 Configuring data-default-instances-containers-0.0.1... Building data-default-instances-containers-0.0.1... Configuring data-default-instances-dlist-0.0.1... Installed data-default-instances-containers-0.0.1 Building data-default-instances-dlist-0.0.1... Configuring MemoTrie-0.6.7... Installed data-default-instances-dlist-0.0.1 Building MemoTrie-0.6.7... Configuring data-default-instances-old-locale-0.0.1... Installed MemoTrie-0.6.7 Building data-default-instances-old-locale-0.0.1... Configuring tf-random-0.5... Installed data-default-instances-old-locale-0.0.1 Building tf-random-0.5... Configuring StateVar-1.1.0.4... Installed text-1.2.2.1 Building StateVar-1.1.0.4... Configuring music-dynamics-literal-1.7... Installed tf-random-0.5 Building music-dynamics-literal-1.7... Configuring vector-0.11.0.0... Installed StateVar-1.1.0.4 Building vector-0.11.0.0... Configuring music-pitch-literal-1.7... Installed music-dynamics-literal-1.7 Building music-pitch-literal-1.7... Configuring prettify-1.0... Installed music-pitch-literal-1.7 Building prettify-1.0... Configuring tagged-0.8.5... Installed prettify-1.0 Building tagged-0.8.5... Installed tagged-0.8.5 Configuring vector-space-0.10.4... Building vector-space-0.10.4... Configuring data-default-0.7.1.1... Installed vector-space-0.10.4 Building data-default-0.7.1.1... Configuring hashable-1.2.4.0... Installed data-default-0.7.1.1 Building hashable-1.2.4.0... Configuring parsec-3.1.11... Installed hashable-1.2.4.0 Building parsec-3.1.11... Configuring QuickCheck-2.9.2... Installed vector-0.11.0.0 Building QuickCheck-2.9.2... Configuring xml-1.3.14... Installed parsec-3.1.11 Building xml-1.3.14... Configuring distributive-0.5.0.2... Installed xml-1.3.14 Building distributive-0.5.0.2... Installed distributive-0.5.0.2 Configuring lilypond-1.7... Building lilypond-1.7... Configuring unordered-containers-0.2.7.1... Installed QuickCheck-2.9.2 Building unordered-containers-0.2.7.1... Configuring constraints-0.8... Installed lilypond-1.7 Building constraints-0.8... Configuring void-0.7.1... Installed constraints-0.8 Configuring scientific-0.3.4.9... Installed unordered-containers-0.2.7.1 Building void-0.7.1... Building scientific-0.3.4.9... Installed void-0.7.1 Configuring HCodecs-0.5... Building HCodecs-0.5... Configuring contravariant-1.4... Installed scientific-0.3.4.9 Building contravariant-1.4... Configuring type-unary-0.3.0... Installed contravariant-1.4 Building type-unary-0.3.0... Installed HCodecs-0.5 Configuring attoparsec-0.13.1.0... Building attoparsec-0.13.1.0... Configuring comonad-5... Installed type-unary-0.3.0 Building comonad-5... Configuring hamid-0.10... Installed attoparsec-0.13.1.0 Building hamid-0.10... Installed comonad-5 Configuring musicxml2-1.7... Building musicxml2-1.7... Configuring bifunctors-5.4.1... Installed hamid-0.10 Building bifunctors-5.4.1... Configuring aeson-1.0.2.1... Installed musicxml2-1.7 Building aeson-1.0.2.1... Installed bifunctors-5.4.1 Configuring semigroupoids-5.1... Building semigroupoids-5.1... Configuring reenact-0.9... Installed semigroupoids-5.1 Building reenact-0.9... Installed reenact-0.9 Configuring music-pitch-1.7... Building music-pitch-1.7... Configuring music-dynamics-1.7... Installed aeson-1.0.2.1 Building music-dynamics-1.7... Configuring music-score-1.2.2... Installed music-dynamics-1.7 Building music-score-1.2.2... Installed music-pitch-1.7 Failed to install music-score-1.2.2 Build log ( /home/builder/.cabal/logs/music-score-1.2.2.log ): cabal: Entering directory '/tmp/cabal-tmp-7088/music-score-1.2.2' Configuring music-score-1.2.2... Building music-score-1.2.2... Preprocessing library music-score-1.2.2... [ 1 of 14] Compiling Music.Score.Duration ( src/Music/Score/Duration.hs, dist/build/Music/Score/Duration.o ) [ 2 of 14] Compiling Music.Score.Time ( src/Music/Score/Time.hs, dist/build/Music/Score/Time.o ) [ 3 of 14] Compiling Music.Score.Part ( src/Music/Score/Part.hs, dist/build/Music/Score/Part.o ) [ 4 of 14] Compiling Music.Score.Score ( src/Music/Score/Score.hs, dist/build/Music/Score/Score.o ) [ 5 of 14] Compiling Music.Score.Ties ( src/Music/Score/Ties.hs, dist/build/Music/Score/Ties.o ) [ 6 of 14] Compiling Music.Score.Pitch ( src/Music/Score/Pitch.hs, dist/build/Music/Score/Pitch.o ) [ 7 of 14] Compiling Music.Score.Rhythm ( src/Music/Score/Rhythm.hs, dist/build/Music/Score/Rhythm.o ) [ 8 of 14] Compiling Music.Score.Track ( src/Music/Score/Track.hs, dist/build/Music/Score/Track.o ) [ 9 of 14] Compiling Music.Score.Voice ( src/Music/Score/Voice.hs, dist/build/Music/Score/Voice.o ) src/Music/Score/Voice.hs:108:9: error: • Non type-variable argument in the constraint: Eq (Voice a1) (Use FlexibleContexts to permit this) • When checking the inferred type extract :: forall (m :: * -> *) a. (HasVoice a, Eq (Voice a), MonadPlus m) => Voice a -> m a -> m a In an equation for ‘voices’: voices sc = fmap (flip extract $ sc) (getVoices sc) where extract v = mfilter ((== v) . getVoice) cabal: Leaving directory '/tmp/cabal-tmp-7088/music-score-1.2.2' cabal: Error: some packages failed to install: music-preludes-1.3.1 depends on music-score-1.2.2 which failed to install. music-score-1.2.2 failed during the building phase. The exception was: ExitFailure 1 music-sibelius-1.3 depends on music-score-1.2.2 which failed to install.