#10251: Bad rule generated in pathological cases -------------------------------------+------------------------------------- Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- George reports: I am also seeing this on ghc 7.10.1, not sure if this is another instance of this bug (#9160): {{{ cabal install bitmap [ 3 of 10] Compiling Data.Bitmap.IO ( Data/Bitmap/IO.hs, dist/build/Data/Bitmap/IO.o ) Data/Bitmap/IO.hs:1248:1: Warning: SPECIALISE pragma for non-overloaded function ‘myPlusPtr’ Data/Bitmap/IO.hs:1249:1: Warning: SPECIALISE pragma for non-overloaded function ‘myPlusPtr’ ghc: panic! (the 'impossible' happened) (GHC version 7.10.1 for x86_64-apple-darwin): Template variable unbound in rewrite rule $fPixelComponentFloat3_X2Rc [$fPixelComponentFloat3_X2Rc] [$fPixelComponentFloat3_X2Rc] [] [] }}} But it's ''not'' #9160 at all. So I'm making a new ticket. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10251 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler