[GHC] #14490: TTG Snags

[GHC]

#14490: TTG Snags
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        Reporter:  alanz             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14482            |  Differential Rev(s):
       Wiki Page:                    |
  ImplementingTreesThatGrow          |
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Comment (by alanz):

 I made a very quick attempt yesterday at removing the Data instances
 completely, but they are in fact used, I introduced them for the dump AST
 stuff.

 I want to first get an idea of what the major performance driver is,
 before focusing exclusively on instances.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14490#comment:20>
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