[GHC] #16208: map/coerce does not fire with all newtypes

[GHC]

#16208: map/coerce does not fire with all newtypes
-------------------------------------+-------------------------------------
        Reporter:  monoidal          |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.10.1
       Component:  Compiler          |              Version:  8.6.3
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  simplCore/should_run/T16208
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/453
-------------------------------------+-------------------------------------

Comment (by RyanGlScott):

 Landed in
 [https://gitlab.haskell.org/ghc/ghc/commit/646b6dfbe125aa756a935e840979ba11b4a882c0
 646b6dfb].

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16208#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler