#13787: The compiler told me to report this. I have no idea what happened -------------------------------------+------------------------------------- Reporter: gleb_dianov | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: duplicate | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: #13106 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * status: new => closed * resolution: => duplicate * related: => #13106 Comment: Thanks for the bug report. I don't have time to dig into the internals of your particular project, but there is a 99.9% chance that this is an occurrence of #13106, a known bug which has been fixed in GHC 8.2.1. The underlying cause is usually that you forgot to import some top-level identifier (in your case, probably `err`). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13787#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler