#13754: ghc-8.0.2+ rejects more instance declarations -------------------------------------+------------------------------------- Reporter: zilinc | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
why it's not rejected by earlier (<8.0.2) versions of GHC
I'm not certain, but I think it's because they had a slightly different implementation of instance declarations that had a fragile special case that happened to work. But it's better now; more robust. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13754#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler