#13132: Compilation fails with a panic: get_op runContT -------------------------------------+------------------------------------- Reporter: PoroCYon | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | 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 RyanGlScott): Here's a minimal test case: {{{#!hs module Bug where newtype ContT r m a = ContT { runContT :: (a -> m r) -> m r } foo = (`runContT` bar.baz) }}} {{{ $ ghc Bug.hs [1 of 1] Compiling Bug ( Bug.hs, Bug.o ) ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-linux): get_op runContT }}} Also reproducible on GHC HEAD. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13132#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler