Warning: The install command is a part of the legacy v1 style of cabal usage. Please switch to using either the new project style and the new-install command or the legacy v1-install alias as new-style projects will become the default in the next version of cabal-install. Please file a bug if you cannot replicate a working v1- use case with the new-style commands. For more information, see: https://wiki.haskell.org/Cabal/NewBuild Resolving dependencies... Starting StateVar-1.2 Starting base-orphans-0.8.1 Starting cabal-doctest-1.0.8 Starting base-prelude-1.3 Building StateVar-1.2 Building base-prelude-1.3 Building base-orphans-0.8.1 Building cabal-doctest-1.0.8 Completed base-orphans-0.8.1 Starting data-default-class-0.1.2.0 Completed StateVar-1.2 Starting hashable-1.3.0.0 Building data-default-class-0.1.2.0 Building hashable-1.3.0.0 Completed cabal-doctest-1.0.8 Starting primitive-0.7.0.0 Building primitive-0.7.0.0 Completed data-default-class-0.1.2.0 Starting property-0.0.1 Building property-0.0.1 Completed hashable-1.3.0.0 Starting semigroups-0.19.1 Completed property-0.0.1 Starting tagged-0.8.6 Completed base-prelude-1.3 Starting th-abstraction-0.3.1.0 Building semigroups-0.19.1 Building tagged-0.8.6 Building th-abstraction-0.3.1.0 Completed semigroups-0.19.1 Starting transformers-compat-0.6.5 Building transformers-compat-0.6.5 Completed tagged-0.8.6 Starting unliftio-core-0.1.2.0 Building unliftio-core-0.1.2.0 Completed th-abstraction-0.3.1.0 Starting void-0.7.3 Completed transformers-compat-0.6.5 Starting contravariant-1.5.2 Completed unliftio-core-0.1.2.0 Starting unordered-containers-0.2.10.0 Building void-0.7.3 Building contravariant-1.5.2 Building unordered-containers-0.2.10.0 Completed void-0.7.3 Starting distributive-0.6.1 Completed contravariant-1.5.2 Starting transformers-base-0.4.5.2 Building distributive-0.6.1 Completed primitive-0.7.0.0 Starting exceptions-0.10.3 Building transformers-base-0.4.5.2 Building exceptions-0.10.3 Completed transformers-base-0.4.5.2 Starting vector-0.12.0.3 Building vector-0.12.0.3 Completed distributive-0.6.1 Starting comonad-5.0.5 Completed exceptions-0.10.3 Building comonad-5.0.5 Completed unordered-containers-0.2.10.0 Completed comonad-5.0.5 Starting bifunctors-5.5.5 Building bifunctors-5.5.5 Completed bifunctors-5.5.5 Starting semigroupoids-5.3.3 Starting profunctors-5.5 Building profunctors-5.5 Building semigroupoids-5.3.3 Completed profunctors-5.5 Starting profunctor-misc-0.0.0.1 Building profunctor-misc-0.0.0.1 Completed vector-0.12.0.3 Starting vector-th-unbox-0.2.1.7 Starting vector-builder-0.3.8 Building vector-th-unbox-0.2.1.7 Building vector-builder-0.3.8 Completed profunctor-misc-0.0.0.1 Completed semigroupoids-5.3.3 Starting connections-0.0.2 Starting free-5.1.2 Building connections-0.0.2 Building free-5.1.2 Completed vector-th-unbox-0.2.1.7 Starting math-functions-0.3.3.0 Building math-functions-0.3.3.0 Completed vector-builder-0.3.8 Completed connections-0.0.2 Starting rings-0.0.2 Building rings-0.0.2 Completed math-functions-0.3.3.0 Starting mwc-random-0.14.0.0 Building mwc-random-0.14.0.0 Completed rings-0.0.2 Completed free-5.1.2 Starting recursion-schemes-5.1.3 Starting adjunctions-4.4 Building recursion-schemes-5.1.3 Building adjunctions-4.4 Completed mwc-random-0.14.0.0 Starting foldl-1.4.5 Building foldl-1.4.5 Completed adjunctions-4.4 Completed recursion-schemes-5.1.3 Completed foldl-1.4.5 Starting profunctor-optics-0.0.0.1 Building profunctor-optics-0.0.0.1 Failed to install profunctor-optics-0.0.0.1 Build log ( /home/builder/.cabal/logs/ghc-8.6.3/profunctor-optics-0.0.0.1-1IOaSqDq2Ug5dbsZafeLe8.log ): cabal: Entering directory '/tmp/cabal-tmp-26108/profunctor-optics-0.0.0.1' Configuring profunctor-optics-0.0.0.1... Preprocessing library for profunctor-optics-0.0.0.1.. Building library for profunctor-optics-0.0.0.1.. [ 1 of 18] Compiling Data.Profunctor.Optic.Prelude ( src/Data/Profunctor/Optic/Prelude.hs, dist/build/Data/Profunctor/Optic/Prelude.o ) [ 2 of 18] Compiling Data.Profunctor.Orphan ( src/Data/Profunctor/Orphan.hs, dist/build/Data/Profunctor/Orphan.o ) src/Data/Profunctor/Orphan.hs:16:10: error: Duplicate instance declarations: instance Contravariant f => Contravariant (Star f a) -- Defined at src/Data/Profunctor/Orphan.hs:16:10 instance Contravariant f => Contravariant (Star f a) -- Defined in ‘Data.Profunctor.Types’ | 16 | instance Contravariant f => Contravariant (Star f a) where | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ src/Data/Profunctor/Orphan.hs:24:10: error: Duplicate instance declarations: instance Cochoice (Forget r) -- Defined at src/Data/Profunctor/Orphan.hs:24:10 instance [safe] Cochoice (Forget r) -- Defined in ‘Data.Profunctor.Choice’ | 24 | instance Cochoice (Forget r) where | ^^^^^^^^^^^^^^^^^^^ cabal: Leaving directory '/tmp/cabal-tmp-26108/profunctor-optics-0.0.0.1' cabal: Error: some packages failed to install: profunctor-optics-0.0.0.1-1IOaSqDq2Ug5dbsZafeLe8 failed during the building phase. The exception was: ExitFailure 1