Right. On 9/27/17, GHC wrote:

#14294: IndexError: pop from empty list -------------------------------------+------------------------------------- Reporter: heisenbug | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 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 bgamari):

Was the URL you were requesting https://ghc.haskell.org/trac/ghc/attachment/ticket/14293/ ?

-- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14294#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler