Resolving dependencies... Starting StateVar-1.2.2 Starting contra-tracer-0.2.0.0 Starting base-orphans-0.8.6 Starting base-compat-0.12.1 Building StateVar-1.2.2 Building contra-tracer-0.2.0.0 Building base-orphans-0.8.6 Building base-compat-0.12.1 Completed contra-tracer-0.2.0.0 Starting dlist-1.0 Completed StateVar-1.2.2 Starting indexed-traversable-0.1.2 Building dlist-1.0 Building indexed-traversable-0.1.2 Completed base-orphans-0.8.6 Starting integer-logarithms-1.0.3.1 Completed dlist-1.0 Starting primitive-0.7.3.0 Building integer-logarithms-1.0.3.1 Building primitive-0.7.3.0 Completed base-compat-0.12.1 Starting splitmix-0.1.0.4 Completed indexed-traversable-0.1.2 Starting tagged-0.8.6.1 Building splitmix-0.1.0.4 Building tagged-0.8.6.1 Completed integer-logarithms-1.0.3.1 Starting th-abstraction-0.4.3.0 Building th-abstraction-0.4.3.0 Completed splitmix-0.1.0.4 Starting transformers-compat-0.7.1 Building transformers-compat-0.7.1 Completed tagged-0.8.6.1 Starting contravariant-1.5.5 Building contravariant-1.5.5 Completed th-abstraction-0.4.3.0 Starting hashable-1.4.0.2 Completed transformers-compat-0.7.1 Starting random-1.2.1 Completed contravariant-1.5.5 Starting distributive-0.6.2.1 Building hashable-1.4.0.2 Building random-1.2.1 Building distributive-0.6.2.1 Completed distributive-0.6.2.1 Starting comonad-5.0.8 Building comonad-5.0.8 Completed hashable-1.4.0.2 Starting unordered-containers-0.2.16.0 Building unordered-containers-0.2.16.0 Completed primitive-0.7.3.0 Starting time-compat-1.9.6.1 Building time-compat-1.9.6.1 Completed comonad-5.0.8 Starting text-short-0.1.5 Building text-short-0.1.5 Completed random-1.2.1 Starting data-fix-0.3.2 Building data-fix-0.3.2 Completed time-compat-1.9.6.1 Starting OneTuple-0.3.1 Building OneTuple-0.3.1 Completed text-short-0.1.5 Starting vector-0.12.3.1 Completed data-fix-0.3.2 Starting scientific-0.3.7.0 Building vector-0.12.3.1 Building scientific-0.3.7.0 Completed OneTuple-0.3.1 Starting bifunctors-5.5.11 Building bifunctors-5.5.11 Completed unordered-containers-0.2.16.0 Starting uuid-types-1.0.5 Building uuid-types-1.0.5 Completed scientific-0.3.7.0 Starting QuickCheck-2.14.2 Building QuickCheck-2.14.2 Completed uuid-types-1.0.5 Starting base-compat-batteries-0.12.1 Building base-compat-batteries-0.12.1 Completed bifunctors-5.5.11 Starting attoparsec-0.14.4 Building attoparsec-0.14.4 Completed base-compat-batteries-0.12.1 Starting semigroupoids-5.3.7 Building semigroupoids-5.3.7 Completed attoparsec-0.14.4 Starting assoc-1.0.2 Building assoc-1.0.2 Completed QuickCheck-2.14.2 Completed assoc-1.0.2 Starting these-1.1.1.1 Building these-1.1.1.1 Completed semigroupoids-5.3.7 Completed these-1.1.1.1 Starting strict-0.4.0.1 Building strict-0.4.0.1 Completed strict-0.4.0.1 Completed vector-0.12.3.1 Starting indexed-traversable-instances-0.1.1 Building indexed-traversable-instances-0.1.1 Completed indexed-traversable-instances-0.1.1 Starting witherable-0.4.2 Starting semialign-1.2.0.1 Building witherable-0.4.2 Building semialign-1.2.0.1 Completed semialign-1.2.0.1 Completed witherable-0.4.2 Starting aeson-2.0.3.0 Building aeson-2.0.3.0 Completed aeson-2.0.3.0 Starting contra-tracers-1.0.0 Building contra-tracers-1.0.0 Failed to install contra-tracers-1.0.0 Build log ( /home/builder/.cabal/logs/ghc-8.10.2/contra-tracers-1.0.0-LMiZwrcy7XE7vifzZYLNNq.log ): cabal: Entering directory '/tmp/cabal-tmp-10672/contra-tracers-1.0.0' Configuring contra-tracers-1.0.0... Preprocessing library for contra-tracers-1.0.0.. Building library for contra-tracers-1.0.0.. [1 of 3] Compiling Data.Severity ( src/Data/Severity.hs, dist/build/Data/Severity.o, dist/build/Data/Severity.dyn_o ) [2 of 3] Compiling Data.Generics.Tracers ( src/Data/Generics/Tracers.hs, dist/build/Data/Generics/Tracers.o, dist/build/Data/Generics/Tracers.dyn_o ) src/Data/Generics/Tracers.hs:125:17: error: " Could not deduce (Monad m) arising from a use of contramap from the context: (ToJSON msg, HasSeverityAnnotation msg, Applicative m) bound by the instance declaration at src/Data/Generics/Tracers.hs:(120,10)-(121,95) Possible fix: add (Monad m) to the context of the type signature for: gConfigureTracers :: forall tr. String -> Tracer m SomeMsg -> K1 i (Const (Maybe Severity) (Tracer m msg)) (Const (Maybe Severity) tr) -> K1 i (Tracer m msg) tr or the instance declaration " In the first argument of K1, namely (contramap (SomeMsg minSeverity field) tr) In the expression: K1 (contramap (SomeMsg minSeverity field) tr) In a case alternative: K1 (Const (Just minSeverity)) -> K1 (contramap (SomeMsg minSeverity field) tr) | 125 | K1 (contramap (SomeMsg minSeverity field) tr) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cabal: Leaving directory '/tmp/cabal-tmp-10672/contra-tracers-1.0.0' cabal: Error: some packages failed to install: contra-tracers-1.0.0-LMiZwrcy7XE7vifzZYLNNq failed during the building phase. The exception was: ExitFailure 1