#12783: RecordWildCards trigger "Impossible happened" in Lucius -------------------------------------+------------------------------------- Reporter: Koterpillar | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The presence of `RecordWildCards` in the following code makes GHC crash with "impossible happened". {{{#!hs #!/usr/bin/env stack -- stack --resolver lts-7.5 runghc --package shakespeare {-# LANGUAGE QuasiQuotes #-} {-# LANGUAGE RecordWildCards #-} import Text.Lucius renderPrintStylesheet = [lucius|p{}|] main :: IO () main = return () }}} {{{ ghc: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-unknown-linux): find_tycon Block [] Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} Removing `RecordWildCards` makes the program compile. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12783 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler