#9575: -XAutoDeriveTypeable fails to generate instances -------------------------------------+------------------------------------- Reporter: hvr | Owner: dreixel Type: bug | Status: new Priority: high | Milestone: 7.8.4 Component: Compiler | Version: 7.8.3 Resolution: | Keywords: Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: | Blocked By: None/Unknown | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by rwbarton): See ticket:8950#comment:3. I don't see what there is to gain by backporting a fix though, even if you could detect GHC 7.8.4, it's still more effort to do so than to just add `Typeable` to the deriving list. And it could break old code that uses `AutoDeriveTypeable`, by causing it to export more instances than it did under 7.8.3. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9575#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler