[GHC] #15648: Core Lint error with source-level unboxed equality

[GHC]

#15648: Core Lint error with source-level unboxed equality
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #15209            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"e7ff9344a18c58c7b321566545fd37c10c609fb1/ghc" e7ff934/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e7ff9344a18c58c7b321566545fd37c10c609fb1"
 Make Lint check that for CoVars more carefully

 Check than an Id of type (t1 ~# t2) is a CoVar; if not,
 it ends up in the wrong simplifier environment, with
 strange consequences. (Trac #15648)
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15648#comment:12>
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