#14365: Panic with (bogus?) deriving in hs-boot: newTyConEtadArity -------------------------------------+------------------------------------- Reporter: happykitten | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: | Keywords: deriving Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4102 Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * status: new => patch * keywords: => deriving * differential: => Phab:D4102 Comment: Well that's embarrassing. The [http://git.haskell.org/ghc.git/blob/317aa966b3d89e45227a5870feba339e34d77a18... GHC users' guide] states that you can't have derived instances in `.hs- boot` files, but clearly we weren't checking for this in practice. Phab:D4102 is an attempt to do so. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14365#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler