[GHC] #13171: panic on negative literal in case on Word

[GHC]

#13171: panic on negative literal in case on Word
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        Reporter:  rwbarton          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"6dfc5ebf70df8f0fdccc5004d914b777f21f3b72/ghc" 6dfc5eb/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="6dfc5ebf70df8f0fdccc5004d914b777f21f3b72"
 Ensure that Literals are in range

 This commit fixes several bugs related to case expressions
 involving numeric literals which are not in the range of values of
 their (fixed-width, integral) type.

 There is a new invariant on Literal: The argument of a MachInt[64]
 or MachWord[64] must lie within the range of the corresponding
 primitive type Int[64]# or Word[64]#, as defined by the target machine.
 This invariant is enforced in mkMachInt[64]/mkMachWord[64] by wrapping
 the argument to the target type's range if necessary.

 Test Plan: Test Plan: make slowtest TEST="T9533 T9533b T9533c T10245
 T10246"

 Trac issues: #9533, #10245, #10246, #13171

 Reviewers: simonmar, simonpj, austin, bgamari, nomeata

 Reviewed By: bgamari

 Subscribers: thomie, rwbarton

 Differential Revision: https://phabricator.haskell.org/D810
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13171#comment:4>
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