#11952: automatic show instance generating loop -------------------------------------+------------------------------ Reporter: maxigit | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: x86 Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------ Changes (by kosmikus): * status: new => closed * resolution: => invalid Comment: An empty instance for `show` is not automatic. It uses the default definitions, which are defined in terms of each other. You can use `StandaloneDeriving` and say {{{ deriving instance Show (A Valid) deriving instance Show (A Invalid) }}} instead and it will work just fine. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11952#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler