#8386: AMP warning on "hiding (join)" -------------------------------------------------+------------------------- Reporter: monoidal | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect warning at | Unknown/Multiple compile-time | Difficulty: Test Case: | Unknown Blocking: | Blocked By: | Related Tickets: -------------------------------------------------+------------------------- Comment (by quchen): I don't think there is an easy fix for this. When you write `import Plreude hiding (join)` right now, you're hiding a function that is not even in `Prelude`. GHC does not issue a warning here though; it just silently adds nothing to the hiding list. For that reason, you cannot check whether `join` is hidden from an import when it's not in there in the first place. See also http://www.haskell.org/haskellwiki/Functor-Applicative- Monad_Proposal#Future_Prelude_names -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8386#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler