[GHC] #10980: Deriving Read instance from datatype with N fields leads to N^2 code size growth

[GHC]

#10980: Deriving Read instance from datatype with N fields leads to N^2 code size
growth
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        Reporter:  slyfox            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:  deriving-perf
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 >  Perhaps this discussion should move to a new ticket, since I remembered
 it is actually not the issue with the derived Read instance after all?

 Sure, #13213

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10980#comment:16>
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