#11336: GHC craches on this combination of ViewPatterns and PatternSynonyms -------------------------------------+------------------------------------- Reporter: baramoglo | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The attached file crashes: {{{ $ ghc Bug.hs [1 of 1] Compiling Bug ( Bug.hs, Bug.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.10.2 for x86_64-unknown-linux): Prelude.last: empty list }}} I wasn't able to shrink the example further despite many attepts. Tested on GHC 7.8.3 and 7.10.2. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11336 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler