[GHC] #14888: The (->) type doesn't survive a TH quote-splice roundtrip

[GHC]

#14888: The (->) type doesn't survive a TH quote-splice roundtrip
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Template Haskell  |              Version:  8.2.2
      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:D4466
       Wiki Page:                    |
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Comment (by Ryan Scott <ryan.gl.scott@…>):

 In [changeset:"6ee831f279c91888ee5815f8eee473bcd6fd25c6/ghc" 6ee831f/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="6ee831f279c91888ee5815f8eee473bcd6fd25c6"
 Fix #14888 by adding more special cases for ArrowT

 Summary:
 There were previously some situations where `(->)` would
 not be desugared or reified as `ArrowT`, leading to various oddities
 such as those observed in #14888. We now uniformly treat `(->)` as
 `ArrowT` in Template Haskell–world by checking for any tycon that
 has the same name as `(->)`, and converting that to `ArrowT`.

 Test Plan: make test TEST=T14888

 Reviewers: goldfire, bgamari, simonpj

 Reviewed By: goldfire, simonpj

 Subscribers: simonpj, rwbarton, thomie, carter

 GHC Trac Issues: #14888

 Differential Revision: https://phabricator.haskell.org/D4466
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14888#comment:2>
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