[GHC] #8852: 7.8.1 uses a lot of memory when compiling attoparsec programs using <|>

[GHC]

#8852: 7.8.1 uses a lot of memory when compiling attoparsec programs using <|>
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              Reporter:  joelteon    |            Owner:
                  Type:  bug         |           Status:  closed
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.1-rc2
            Resolution:  fixed       |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Compile-    |       Blocked By:
  time performance bug               |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by simonpj):

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


Comment:

 OK I have finally fixed this bug.  I think there is a good chance that
 doing so has also fixed #8852, #8980, #8941 (possibly), #8960, #7898,
 #7068, #7944,  #8836.  I have turned these tickets into info-needed
 status, because they are hard to reproduce, but this ticked #8852 is
 definitely fine now.

 It's kind of hard to make a regression test without depending on an (out
 of date version of) attoparsec, and its dependencies, so I'm not adding a
 regression test at all for now.

 Phew

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8852#comment:7>
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