#11369: Suppress redundant-constraint warnings in case of empty classes -------------------------------------+------------------------------------- Reporter: hvr | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #11370 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): I think this is just a bug in the code that infers the context for the instance declaration that arises from GND. We should tet {{{ instance {- Empty context!! -} C (Identity a) where type T (Identity a) = T a }}} Where is that code? I can help with this after the PLDI deadline. Anyway, I think this is unrelated to the original topic of the ticket. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11369#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler