[GHC] #10180: Lint check: Empty alternatives imply bottoming scrutinee

[GHC]

#10180: Lint check: Empty alternatives imply bottoming scrutinee
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        Reporter:  nomeata           |                   Owner:  nomeata
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by Joachim Breitner <mail@…>):

 In [changeset:"5673bfc49ec1e54a1540197078041a9da9754fa3/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="5673bfc49ec1e54a1540197078041a9da9754fa3"
 exprIsBottom should look through type lambdas

 as evaluting (\ (@ a) -> e) diverges if and only if evaluating e
 diverges. This was found in the context of #10180.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10180#comment:14>
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