[GHC] #10829: Simplification in the RHS of rules

[GHC]

#10829: Simplification in the RHS of rules
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        Reporter:  afarmer           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.3
       Component:  Compiler          |                 Version:  7.10.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  10528             |  Differential Revisions:
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Comment (by simonpj):

 I think that Option 1 would be fine.  Could someone try it?
  * In `Simplify.simplRule`, define `rhs_env = lhs_env`.
  * Probably rename `updModeForRuleLHS` to `updModeForRule`
  * Add a `Note` with `updModeForRule` to explain why we also do no
 inlining on rule RHSs, citing the ticket.
  * Check that there is no `nofib` impact.

 Andrew: maybe you can do this?

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10829#comment:4>
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