[3 of 5] Compiling StreamSpec ( test/StreamSpec.hs, dist/build/conduit-test/conduit-test-tmp/StreamSpec.o )
test/StreamSpec.hs:466:10: error:
• Could not deduce (Prelude.Semigroup (Sum a))
arising from the superclasses of an instance declaration
from the context: Prelude.Num a
bound by the instance declaration at test/StreamSpec.hs:466:10-40
There are instances for similar types:
instance Prelude.Num a =>
Prelude.Semigroup (base-4.11.0.0:Data.Semigroup.Internal.Sum a)
-- Defined in ‘base-4.11.0.0:Data.Semigroup.Internal’
• In the instance declaration for ‘Monoid (Sum a)’
|
466 | instance Prelude.Num a => Monoid (Sum a) where
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^