#12411: GHC panic on TypeApplications + TemplateHaskell -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple TypeApplications, TemplateHaskell | Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- This fails {{{ $ ghci -XTemplateHaskell -ignore-dot-ghci GHCi, version 8.0.1: http://www.haskell.org/ghc/ :? for help Prelude> import Control.Lens Prelude Control.Lens> data A = B { _int :: Int } Prelude Control.Lens> pure @Q []; makeLenses ''A ghc: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-unknown-linux): tcMonoExpr _ Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug Prelude Control.Lens> }}} sorry, don't have time for more detail -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12411 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler