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Add support for typed holes in Template Haskell

I want to be able to work with typed holes using Template Haskell. These are currently rejected:

[d| i :: a -> a
    i x = _ |]
Expression form not (yet) handled by Template Haskell _
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Trac field Value
Version 7.10.1
Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Template Haskell
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