(a :: (k :: Type)) is too exotic for Template Haskell

On GHC 8.0.1 or later, GHC will choke on this code:

{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeInType #-}
module Bug where

import Data.Kind
import Data.Proxy

$([d| f :: Proxy (a :: (k :: Type))
      f = Proxy
    |])

GHCi, version 8.2.0.20170522: http://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /home/rgscott/.ghci
[1 of 1] Compiling Bug              ( Bug.hs, interpreted )

Bug.hs:8:3: error:
    Exotic form of kind not (yet) handled by Template Haskell
      (k :: Type)
  |
8 | $([d| f :: Proxy (a :: (k :: Type))
  |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^...

I don't think this would be too hard to support, though. I'll take a shot at fixing this.

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Template Haskell
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