[GHC] #7060: Option -ddump-rule-rewrites doesn't dump to a file

[GHC]

#7060: Option -ddump-rule-rewrites doesn't dump to a file
-------------------------------+--------------------------------------------
  Reporter:  erikd             |          Owner:                  
      Type:  bug               |         Status:  new             
  Priority:  high              |      Milestone:  7.6.1           
 Component:  Compiler          |        Version:  7.5             
Resolution:                    |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  Other             |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------
Changes (by simonmar):

  * owner:  pcapriotti =>
  * priority:  normal => high
  * status:  closed => new
  * resolution:  fixed =>


Comment:

 This broke the test `perf/compiler/T4007` (different output).  Also I
 wonder whether the new output isn't too verbose; before we had

 {{{
 Rule fired: unpack
 Rule fired: Class op >>
 Rule fired: Class op return
 Rule fired: <=#
 Rule fired: fold/build
 Rule fired: unpack-list
 }}}

 and now we have

 {{{
 ====================  ====================
 Rule fired
 unpack



 ====================  ====================
 Rule fired
 Class op >>



 ====================  ====================
 Rule fired
 Class op return



 ====================  ====================
 Rule fired
 <=#



 ====================  ====================
 Rule fired
 fold/build



 ====================  ====================
 Rule fired
 unpack-list

 }}}

 Do we really want it to look like this?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7060#comment:4>
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