[GHC] #11380: `cabal repl` exhausts memory

[GHC]

#11380: `cabal repl` exhausts memory
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        Reporter:  kennethb          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Old description:

> I have a project that depends on happy/alex to generate parsers.
> (https://github.com/TOSPIO/pyn)
>
> Running `cabal repl` on my laptop with 16GiB memory ended up eating up
> all memory and eventually resulted in kernel panic.
>
> `cabal build` works fine. Problem arises when compiling the giant happy-
> generated dist/build/Language/Python/Parser/Parse.hs file
>
> also `cabal repl --ghc-options=-fobject-code` works fine.

New description:

 I have a project that depends on happy/alex to generate parsers.
 (https://github.com/TOSPIO/pyn)

 Running `cabal repl` on my laptop with 16GiB memory ended up eating up all
 memory and eventually resulted in kernel panic.

 Problem arises when compiling the giant happy-generated
 dist/build/Language/Python/Parser/Parse.hs file. The memory usage is flat
 (~1.5G) within the first 2 mins, and the soars up to over 10GB within
 seconds.

 `cabal build` and `cabal repl --ghc-options=-fobject-code` works fine.

--

Comment (by kennethb):

 I noticed that

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11380#comment:3>
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