[GHC] #8067: -XDefaultSignatures panic in type error diagnostic

[GHC]

#8067: -XDefaultSignatures panic in type error diagnostic
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        Reporter:  exFalso           |            Owner:
            Type:  bug               |           Status:  closed
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:  duplicate         |         Keywords:  defaultsignatures
Operating System:  Linux             |  panic
 Type of failure:  Compile-time      |     Architecture:  x86_64 (amd64)
  crash                              |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by monoidal):

 * status:  new => closed
 * resolution:   => duplicate


Comment:

 Thanks for the report; it is a duplicate of #8055 and related bugs, fixed
 in HEAD. In fact you do not need default signatures: `fun = lift :: () ->
 () -> m a` is enough to crash 7.6.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8067#comment:1>
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