[GHC] #12164: Type signatures in patterns not (yet) handled by Template Haskell

[GHC]

#12164: Type signatures in patterns not (yet) handled by Template Haskell
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        Reporter:  ezyang            |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Template Haskell  |              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):  Phab:D2490
       Wiki Page:                    |
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Comment (by goldfire):

 Yes, I imagine without scoped type variables, this wouldn't be so hard.
 With them might be more challenging. Does your use-case require binding
 variables in the pattern type signature?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12164#comment:2>
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