#11139: Add Semigroup warnings -------------------------------------+------------------------------------- Reporter: quchen | Owner: Type: task | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Similar to #8004, do the following for Semigroup/Monoid: 1. Warn when an instance of a class has been given, but the type does not have a certain superclass instance 2. Warn when top-level definitions conflict with future Prelude names -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11139 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler