[GHC] #13123: Regression: TH splice requires TypeInType when it shouldn't

[GHC]

#13123: Regression: TH splice requires TypeInType when it shouldn't
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Template Haskell  |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2974
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by RyanGlScott):

 In light of Richard's suggestion on the Phab Diff, I've opened
 [https://github.com/ghc-proposals/ghc-proposals/pull/36 a GHC proposal] to
 discuss the specifics of introducing `ImplicitForallT` and
 `ImplicitForallC` to contain implicitly quantified type variables in
 quoted type signatures.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13123#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler