[GHC] #13292: Type checker rejects ambiguous top level declaration.

[GHC]

#13292: Type checker rejects ambiguous top level declaration.
-------------------------------------+-------------------------------------
        Reporter:  jeiea             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.2
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by rwbarton):

 The issue isn't the warning/error, it's the fact that GHC panicked
 afterward.

 It would be helpful to have steps to reproduce that don't involve stack.
 E.g. `stack repl` is presumably invoking ghci somehow, what command
 exactly does it run?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13292#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler