Resolving dependencies... Starting cabal-doctest-1.0.8 Starting dlist-1.0 Starting base-orphans-0.8.2 Starting base-compat-0.11.1 Building cabal-doctest-1.0.8 Building dlist-1.0 Building base-orphans-0.8.2 Building base-compat-0.11.1 Completed cabal-doctest-1.0.8 Starting hashable-1.3.0.0 Building hashable-1.3.0.0 Completed dlist-1.0 Starting integer-logarithms-1.0.3 Completed base-orphans-0.8.2 Starting primitive-0.7.1.0 Building integer-logarithms-1.0.3 Building primitive-0.7.1.0 Completed integer-logarithms-1.0.3 Starting semigroups-0.19.1 Building semigroups-0.19.1 Completed hashable-1.3.0.0 Starting some-1.0.1 Building some-1.0.1 Completed base-compat-0.11.1 Starting splitmix-0.1.0.1 Completed semigroups-0.19.1 Starting tagged-0.8.6 Building splitmix-0.1.0.1 Building tagged-0.8.6 Completed some-1.0.1 Starting th-abstraction-0.3.2.0 Completed splitmix-0.1.0.1 Starting transformers-compat-0.6.5 Building th-abstraction-0.3.2.0 Building transformers-compat-0.6.5 Completed tagged-0.8.6 Starting type-equality-1 Building type-equality-1 Completed type-equality-1 Starting time-compat-1.9.3 Building time-compat-1.9.3 Completed transformers-compat-0.6.5 Starting unordered-containers-0.2.12.0 Building unordered-containers-0.2.12.0 Completed th-abstraction-0.3.2.0 Starting data-fix-0.3.0 Building data-fix-0.3.0 Completed time-compat-1.9.3 Starting base-compat-batteries-0.11.1 Completed primitive-0.7.1.0 Starting random-1.2.0 Completed data-fix-0.3.0 Starting distributive-0.6.2 Building base-compat-batteries-0.11.1 Building random-1.2.0 Building distributive-0.6.2 Completed distributive-0.6.2 Starting constraints-0.12 Completed base-compat-batteries-0.11.1 Starting vector-0.12.1.2 Building constraints-0.12 Building vector-0.12.1.2 Completed unordered-containers-0.2.12.0 Starting scientific-0.3.6.2 Completed random-1.2.0 Starting comonad-5.0.6 Building scientific-0.3.6.2 Building comonad-5.0.6 Completed scientific-0.3.6.2 Starting uuid-types-1.0.3 Building uuid-types-1.0.3 Completed constraints-0.12 Starting attoparsec-0.13.2.4 Building attoparsec-0.13.2.4 Completed comonad-5.0.6 Starting bifunctors-5.5.7 Building bifunctors-5.5.7 Completed uuid-types-1.0.3 Completed attoparsec-0.13.2.4 Completed bifunctors-5.5.7 Starting assoc-1.0.2 Building assoc-1.0.2 Completed assoc-1.0.2 Starting these-1.1.1.1 Building these-1.1.1.1 Completed these-1.1.1.1 Starting strict-0.4 Building strict-0.4 Completed strict-0.4 Completed vector-0.12.1.2 Starting aeson-1.5.3.0 Building aeson-1.5.3.0 Completed aeson-1.5.3.0 Starting constraints-extras-0.3.0.2 Building constraints-extras-0.3.0.2 Completed constraints-extras-0.3.0.2 Starting dependent-sum-0.7.1.0 Building dependent-sum-0.7.1.0 Completed dependent-sum-0.7.1.0 Starting typelits-witnesses-0.4.0.0 Building typelits-witnesses-0.4.0.0 Completed typelits-witnesses-0.4.0.0 Starting modular-arithmetic-2.0.0.0 Building modular-arithmetic-2.0.0.0 Failed to install modular-arithmetic-2.0.0.0 Build log ( /home/builder/.cabal/logs/ghc-8.6.3/modular-arithmetic-2.0.0.0-4MmibuEljfX7R41hdKmpqc.log ): cabal: Entering directory '/tmp/cabal-tmp-15546/modular-arithmetic-2.0.0.0' Configuring modular-arithmetic-2.0.0.0... Preprocessing library for modular-arithmetic-2.0.0.0.. Building library for modular-arithmetic-2.0.0.0.. [1 of 1] Compiling Data.Modular ( src/Data/Modular.hs, dist/build/Data/Modular.o ) src/Data/Modular.hs:296:12: error: • Couldn't match type ‘p’ with ‘Proxy’ Expected type: Proxy n Actual type: p n • When checking that the pattern signature: p n fits the type of its context: Proxy n In the pattern: _ :: p n In the pattern: SomeNat (_ :: p n) | 296 | SomeNat (_ :: p n) <- someNatVal n | ^^^^^^^^ cabal: Leaving directory '/tmp/cabal-tmp-15546/modular-arithmetic-2.0.0.0' cabal: Error: some packages failed to install: modular-arithmetic-2.0.0.0-4MmibuEljfX7R41hdKmpqc failed during the building phase. The exception was: ExitFailure 1