[GHC] #11254: GHC panic

[GHC]

#11254: GHC panic
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        Reporter:  Iceland_jack      |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/should_compile/T11254
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Richard Eisenberg <eir@…>):

 In [changeset:"39ea4b4b19ea65d05f0d946084b316d5f5d2e675/ghc"
 39ea4b4b/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="39ea4b4b19ea65d05f0d946084b316d5f5d2e675"
 Fix #11254.

 This moves the call to tcSubType into the context of the
 checkInstConstraints call, allowing the deferred type error
 somewhere to hang its hat.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11254#comment:8>
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