src/Data/Function/Compose/LeftToRight.hs:1:55:
Ambiguous occurrence ‘<$’
It could refer to either ‘Data.Function.Compose.LeftToRight.<$’,
defined at src/Data/Function/Compose/LeftToRight.hs:9:1
or ‘Prelude.<$’,
imported from ‘Prelude’ at src/Data/Function/Compose/LeftToRight.hs:1:8-40
(and originally defined in ‘GHC.Base’)
Citing from http://hydra.cryp.to/build/1330851/log/raw: