[GHC] #11361: Test tc253 doesn't pass with reversed uniques

[GHC]

#11361: Test tc253 doesn't pass with reversed uniques
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        Reporter:  niteria           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"cb24e684759f3d181a104cde76f0f95da896a7ef/ghc" cb24e68/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="cb24e684759f3d181a104cde76f0f95da896a7ef"
 Fix typecheck of default associated type decls

 This bug was thrown up by Trac #11361, but I found that the
 problem was deeper: GHC was allowing

   class C a where
     type F (a :: k) :: *
     type F (x :: *) = x    -- Not right!

 (Which is now indexed-types/should_compile/T11361a.)

 Anyway the fix is relatively simple; use tcMatchTys in
 tcDefaultAssocDecl.

 Merge to 8.0 branch.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11361#comment:7>
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