[GHC] #12367: Commit adding instances to GHC.Generics regression compiler performance

[GHC]

#12367: Commit adding instances to GHC.Generics regression compiler performance
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  Generics
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:                    |
-------------------------------------+-------------------------------------

Comment (by bgamari):

 This minimal program is enough to trigger `GHC.Generics` to be loaded with
 673efccb3b348e9daf23d9e65460691bbea8586e yet not without,

 {{{#!hs
 module OhNoTooManyInterfaces where

 concrep :: Int -> [a] -> [a]
 concrep x y = concat (take x (repeat y))
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12367#comment:13>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler