[GHC] #14928: TH eats 50 GB memory when creating ADT with multiple constructors

[GHC]

#14928: TH eats 50 GB memory when creating ADT with multiple constructors
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        Reporter:  YitzGale          |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Template Haskell  |              Version:  8.2.2
      Resolution:  fixed             |             Keywords:
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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Changes (by bgamari):

 * status:  new => closed
 * resolution:   => fixed
 * milestone:  8.6.1 => 8.4.1


Comment:

 I can reproduce the high residency when building `snoyman-master` with GHC
 8.2.1 (or GHC 8.4.1) and optimisation enabled, but have been unable to do
 so with GHC `master`. I believe the memory leak present in 8.2/8.4 has
 since been fixed. For what it's worth, I was also able to reproduce the
 issue using a Nix `ghcHEAD` snapshot from 20180118, so it was fixed
 relatively recently.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14928#comment:5>
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