#13135: Typechecker "panic! the 'impossible' happened" -------------------------------------+------------------------------------- Reporter: Saulzar | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): To be precise, here's the particular panic it gives: {{{ $ /opt/ghc/8.0.2/bin/ghci NanoFeldspar.hs GHCi, version 8.0.2: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/rgscott/.ghci [1 of 1] Compiling NanoFeldspar ( NanoFeldspar.hs, interpreted ) NanoFeldspar.hs:122:10: error:ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-linux): No skolem info: t_a2xN }}} Reproducible on GHC 8.0.1, 8.0.2, and HEAD. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13135#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler