[GHC] #12554: Testsuite exhibits large amount of framework failures

[GHC]

#12554: Testsuite exhibits large amount of framework failures
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        Reporter:  Phyx-             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Test Suite        |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Alright, so I've been trying to work out how to downgrade our Windows
 builder to a non-broken version of `msys2-runtime` (namely 2.5.1). It
 seems that the current installer executable ships with a 2.6 runtime,
 which is not compatible with the 2.5 series. Consequently it is necessary
 to use a release from July 2016 instead
 (http://repo.msys2.org/distrib/x86_64/msys2-base-x86_64-20160719.tar.xz).
 From this release you can downgrade the runtime with `pacman -U`. Namely
 I'm using
 http://repo.msys2.org/msys/x86_64/msys2-runtime-2.5.1-1-x86_64.pkg.tar.xz.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12554#comment:17>
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