[GHC] #12711: GHC Internal error, unboxed sums

[GHC]

#12711: GHC Internal error, unboxed sums
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        Reporter:  Iceland_jack      |                Owner:  osa1
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  UnboxedSums
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2753
       Wiki Page:                    |
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Comment (by Ömer Sinan Ağacan <omeragacan@…>):

 In [changeset:"14ac3725eb1e93289f205cbf432b537f6c84c4dc/ghc"
 14ac3725/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="14ac3725eb1e93289f205cbf432b537f6c84c4dc"
 Collect wildcards in sum types during renaming (#12711)

 This patch also removes the "catch all" pattern in the function and
 explicitly lists constructors to get a warning in the future if a new
 `HsType` was added.

 Reviewers: bgamari, austin, simonpj

 Reviewed By: simonpj

 Subscribers: simonpj, thomie

 Differential Revision: https://phabricator.haskell.org/D2753

 GHC Trac Issues: #12711
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12711#comment:4>
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