[GHC] #15549: Core Lint error with EmptyCase

[GHC]

#15549: Core Lint error with EmptyCase
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler (Type    |              Version:  8.4.3
  checker)                           |             Keywords:  TypeFamilies,
      Resolution:                    |  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Compile-time      |            Test Case:
  crash or panic                     |  typecheck/should_compile/T15549[ab]
      Blocked By:                    |             Blocking:
 Related Tickets:  #14729            |  Differential Rev(s):
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/208
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * status:  patch => merge
 * testcase:   => typecheck/should_compile/T15549[ab]
 * milestone:  8.10.1 => 8.8.1


Comment:

 Landed in
 [https://gitlab.haskell.org/ghc/ghc/commit/2b90356d26b4699227816ad9424e766eccdb6c36
 2b90356d26b4699227816ad9424e766eccdb6c36]. (Given the complexity of this
 patch, I'm not sure if it's worth trying to merge to 8.8 or not.) Echoing
 https://ghc.haskell.org/trac/ghc/ticket/14729#comment:14, this is a merge
 candidate for 8.8.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15549#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler