[GHC] #15071: :set usage in ghci tests breaks platform independence of output

[GHC]

#15071: :set usage in ghci tests breaks platform independence of output
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.6.1
          Component:  Test Suite     |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Numerous GHCi tests are currently failing on Windows due to the use of
 `:set`, which prints the default flag set, which is platform dependent.
 For instance:
 {{{
 --- "/tmp/ghctest-eo_ri0ye/test
 spaces/./ghci/scripts/ghci024.run/ghci024.stdout.normalised"  2018-04-19
 18:35:50.927278200 +0000
 +++ "/tmp/ghctest-eo_ri0ye/test
 spaces/./ghci/scripts/ghci024.run/ghci024.run.stdout.normalised"
 2018-04-19 18:35:50.927278200 +0000
 @@ -7,7 +7,6 @@
  GHCi-specific dynamic flag settings:
  other dynamic, non-language, flag settings:
    -fno-diagnostics-show-caret
 -  -fexternal-dynamic-refs
    -fignore-optim-changes
    -fignore-hpc-changes
    -fno-ghci-history
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15071>
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