[GHC] #16127: Panic: piResultTys1 in compiler/types/Type.hs:1022:5

[GHC]

#16127: Panic: piResultTys1 in compiler/types/Type.hs:1022:5
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        Reporter:  _deepfire         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.6.1
  checker)                           |
      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:                    |
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Comment (by RyanGlScott):

 Alas, I can't follow the directions to reproduce this, as it fails quite
 early for me:

 {{{
 $ nix-shell
 unpacking
 'https://github.com/NixOS/nixpkgs/archive/cd68a8c7cc602e75a4abbadc94663347a73ae24e.tar.gz'...
 error: undefined variable 'stdenv' at
 /home/rgscott/Documents/Hacking/Haskell/holotype/manual-
 overrides.nix:24:15
 (use '--show-trace' to show detailed location information)
 }}}

 If you could produce a reproducible example without the steep requirement
 to install Nix or `reflex`, that would be greatly helpful.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16127#comment:5>
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