[GHC] #10528: compile time performance regression with OverloadedStrings and Text

[GHC]

#10528: compile time performance regression with OverloadedStrings and Text
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        Reporter:  jakewheat         |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.10.3
       Component:  Compiler          |                 Version:  7.10.2-rc2
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by simonpj):

 > > When rewriting in a rule (or unfolding), GHC sets the phase to the
 activation phase of the rule (or unfolding);"
 > what does "the phase" refer to?

 The simplifier has an ambient phase.  We just set the ambient phase before
 rewriting in unfoldings and rewrite rules.  See `Note [Simplifying inside
 stable unfoldings]` in `SimplUtils`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10528#comment:25>
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