[GHC] #12694: GHC HEAD no longer reports inaccessible code

[GHC]

#12694: GHC HEAD no longer reports inaccessible code
-------------------------------------+-------------------------------------
        Reporter:  ezyang            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      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 ezyang):

 I would suggest putting it under a `-W` option but you've mentioned it in
 the ticket; in any case, I doubt it will help anyone who doesn't already
 know what's going on. I ran into this because I was debugging something
 that was marked insoluble that wasn't (very confusing! At least the
 "warning" is printed in `ddump-tc-trace`.)

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12694#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler