ext/PrettyPrint/ANSI/Leijen.hs:312:24:
Ambiguous occurrence ‘<$>’
It could refer to either ‘Text.PrettyPrint.ANSI.Leijen.<$>’,
defined at Text/PrettyPrint/ANSI/Leijen.hs:372:3
or ‘Prelude.<$>’,
imported from ‘Prelude’ at Text/PrettyPrint/ANSI/Leijen.hs:76:8-35
(and originally defined in ‘Data.Functor’)
Citing from http://hydra.cryp.to/build/626491/nixlog/2/raw: