[GHC] #13674: Poor error message which masks occurs-check failure

[GHC]

#13674: Poor error message which masks occurs-check failure
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |
      Resolution:  fixed             |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHC rejects       |            Test Case:
  valid program                      |  indexed_types/should_fail/T13674
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * status:  new => closed
 * testcase:   => indexed_types/should_fail/T13674
 * resolution:   => fixed


Comment:

 This was a very interesting ticket that showed up quite a deep bug.
 Thanks!

 I don't think this is worth merging. It's a very dark corner, the change
 is significant, and there's a chance that I've done something wrong
 (notwithstanding validate).

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13674#comment:13>
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