[GHC] #12538: Incorrect usage of overlapping instances and data families sends GHC into loop

[GHC]

#12538: Incorrect usage of overlapping instances and data families sends GHC into
loop
-------------------------------------+-------------------------------------
        Reporter:  pkmx              |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:  indexed-
                                     |  types/should_compile/T12538
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * status:  new => closed
 * testcase:   => indexed-types/should_compile/T12538
 * resolution:   => fixed


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12538#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler