#14490: TTG Snags -------------------------------------+------------------------------------- Reporter: alanz | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #14482 | Differential Rev(s): Wiki Page: | ImplementingTreesThatGrow | -------------------------------------+------------------------------------- Comment (by alanz): I am not sure if I misunderstand Plan F, but GHC insists on a `Data` instance for the `x` in {{{#!hs newtype GhcExt x = Ext x instance (Data x) => Data (GhcExt x) where gmapM _f x = return x gunfold k z c = case constrIndex c of 1 -> k (z Ext) _ -> panic "GhcExt.gunfold" dataTypeOf _ = mkNoRepType "HsExtension.GhcExt" }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14490#comment:39 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler