#8470: "Fix" spurious Unused do-bind warnings -------------------------------------+------------------------------------ Reporter: 2piix | Owner: Type: feature request | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: worksforme | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Changes (by goldfire): * status: new => closed * resolution: => worksforme Comment: I agree that no warning should be emitted for a monadic action that returns `()`. But, I can't seem to reproduce this behavior with 7.6.3. For example, when I compile {{{ {-# OPTIONS_GHC -Wall #-} module Bug where getA :: IO Int getA = return 5 performSideEffect :: IO () performSideEffect = return () someComplicatedIOAction :: IO () someComplicatedIOAction = do a <- getA performSideEffect putStrLn . show $ a }}} I get no warnings. Is there something I'm missing here? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8470#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler