[GHC] #11362: T6137 doesn't pass with reversed uniques

[GHC]

#11362: T6137 doesn't pass with reversed uniques
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        Reporter:  niteria           |                Owner:  niteria
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:  4012
 Related Tickets:  #11371            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"e2f7d777bb7e4c176e01e1c4f8184f115253dee0/ghc"
 e2f7d777/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e2f7d777bb7e4c176e01e1c4f8184f115253dee0"
 A tiny, outright bug in tcDataFamInstDecl

 This bug was revealed by Trac #11362.  It turns out that in my patch
 for Trac #11148 (namely 1160dc5), I failed to turn one occurrence of
 tvs' into full_tvs.  Sigh.  This is tricky stuff and it cost me
 several hours to page it back in and figure out what was happening.

 The result was a CoAxiom whose lhs had rhs had different kinds.  Eeek!

 Anyway it's fixed.

 I also added an ASSERT, in FamInst.newFamInst, that trips on such
 bogus CoAxioms.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11362#comment:6>
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