#13064: Incorrect redudant imports warning -------------------------------------+------------------------------------- Reporter: phadej | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by phadej): I found even more minimal examples, they aren't tied to instances: {{{ % cat Next.hs import Control.Applicative import Prelude (IO, pure) main :: IO () main = pure () % cat Next2.hs import Control.Applicative import Prelude (IO, pure) main :: IO () main = () <$ pure () % $(ghc-select ghc-7.10.3) % ghc -Wall -fforce-recomp Next.hs [1 of 1] Compiling Main ( Next.hs, Next.o ) Next.hs:2:1: Warning: The import of ‘pure’ from module ‘Prelude’ is redundant Linking Next ... % ghc -Wall -fforce-recomp Next2.hs [1 of 1] Compiling Main ( Next2.hs, Next2.o ) Next2.hs:2:1: Warning: The import of ‘pure’ from module ‘Prelude’ is redundant Linking Next2 ... % $(ghc-select ghc-8.0.1) % ghc -Wall -fforce-recomp Next.hs [1 of 1] Compiling Main ( Next.hs, Next.o ) Next.hs:1:1: warning: [-Wunused-imports] The import of ‘Control.Applicative’ is redundant except perhaps to import instances from ‘Control.Applicative’ To import instances alone, use: import Control.Applicative() Linking Next ... % ghc -Wall -fforce-recomp Next2.hs [1 of 1] Compiling Main ( Next2.hs, Next2.o ) Linking Next2 ... }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13064#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler