[GHC] #13080: Memory leak caused by nested monadic loops

[GHC]

#13080: Memory leak caused by nested monadic loops
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        Reporter:  Feuerbach         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 >  So, it seems to me we need a new kind of Core lambda, or a flag on
 lambda, that means (a) don't float out of this, (b) don't beta reduce
 this.

 We already have (a), namely one-shot lambdas.  I don't understand why (b)
 could possibly be good.

 Perhaps someone can give a from-scratch articulation of the problem and
 possible solutions, informed by this thread?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13080#comment:19>
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