[GHC] #12821: Find the incredible vanishing [The improvement story]

[GHC]

#12821: Find the incredible vanishing [The improvement story]
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        Reporter:  bgamari           |                Owner:
            Type:  task              |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 See `Note [The improvement story and derived shadows]` in `TcSMonad`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12821#comment:4>
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