[GHC] #13535: vector test suite uses excessive memory on GHC 8.2

[GHC]

#13535: vector test suite uses excessive memory on GHC 8.2
-------------------------------------+-------------------------------------
           Reporter:  RyanGlScott    |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:  8.2.1
          Component:  Compiler       |           Version:  8.1
           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:
-------------------------------------+-------------------------------------
 First noticed
 [https://github.com/haskell/vector/pull/161#issuecomment-292031845 here].
 I haven't managed to boil this down to a test case with no dependencies
 yet, so for the time being, this requires `vector`. To reproduce, follow
 these steps:

 {{{
 $ git clone https://github.com/erikd/vector
 $ cd vector/
 $ cabal install --only-dependencies --enable-tests -w
 /opt/ghc/8.2.1/bin/ghc
 $ cabal configure --enable-tests -w /opt/ghc/8.2.1/bin/ghc
 $ cabal test
 }}}

 When building `vector-tests-O2`, GHC will stall when compiling the
 `Tests.Vector` module. On machines with modest memory allowances (e.g.,
 [https://travis-ci.org/haskell/vector/jobs/218749281#L1270 the machines
 used on Travis CI]), GHC will be killed with an out-of-memory error after
 trying to compile `Tests.Vector` for a while.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13535>
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