#14777: panic when using a function defined in terms of `error` -------------------------------------+------------------------------------- Reporter: zilinc | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by tdammers): Further, the following both get rid of the panic: - Moving `__impossible` into `Desugar.hs` - Declaring `{-#INLINE __impossible #-}` Both would lead to GHC inlining `__impossible`. This would explain how it is possible for seemingly benign changes to influence the appearance of the panic - changing small things would change the inlining heuristics, and bug may or may not be hit depending on the intermediate code (Core / STG) being generated. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14777#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler