[GHC] #13027: The let/app invariant, evaluated-ness, and reallyUnsafePtrEquality#

[GHC]

#13027: The let/app invariant, evaluated-ness, and reallyUnsafePtrEquality#
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        Reporter:  erikd             |                Owner:  dfeuer
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Building GHC      |            Test Case:
  failed                             |  simplCore/should_compile/T13027
      Blocked By:                    |             Blocking:
 Related Tickets:  #11444            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 Lots of other primops with IO-ish type do have `can_fail` and
 `has_side_effects` set though, even "read-only" ones like
 {{{
 readMutVar# :: MutVar# s a -> State# s -> (# State# s, a #)
 }}}
 I know that it's not exactly a convincing argument that `seq#` needs the
 flags, but it makes me wonder...

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13027#comment:34>
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