[GHC] #14828: panic! when using :print on some functions with class constraints?

[GHC]

#14828: panic! when using :print on some functions with class constraints?
-------------------------------------+-------------------------------------
        Reporter:  jol               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  8.2.2
      Resolution:                    |             Keywords:  debugger
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bgamari):

 Adding test in !192.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14828#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler