[GHC] #12762: ASSERT failures on HEAD following typechecker refactoring

[GHC]

#12762: ASSERT failures on HEAD following typechecker refactoring
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        Reporter:  simonpj           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"1221f8104bb5123c18bd5b840cde9ab2e71247d5/ghc" 1221f81/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1221f8104bb5123c18bd5b840cde9ab2e71247d5"
 Don't instantaite when typechecking a pattern synonym

 Fixes most of the cases in Trac #12762
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12762#comment:1>
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