#7710: AutoDeriveTypeable and synonyms --------------------------------------+------------------------------------- Reporter: monoidal | Owner: Type: bug | Status: new Priority: normal | Component: Compiler Version: 7.7 | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: GHC rejects valid program | Blockedby: Blocking: | Related: --------------------------------------+------------------------------------- {{{ {-# LANGUAGE AutoDeriveTypeable, DeriveDataTypeable, TypeSynonymInstances #-} type T = Int }}} reports duplicate instance for `Typeable Int` error. In my opinion type synonyms should be excluded from -XAutoDeriveTypeable. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7710 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler