[GHC] #15088: Test T3234 is fragile

[GHC]

#15088: Test T3234 is fragile
-------------------------------------+-------------------------------------
        Reporter:  mpickering        |                Owner:  RolandSenn
            Type:  task              |               Status:  patch
        Priority:  lowest            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:  T3234
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RolandSenn):

 * testcase:   => T3234
 * status:  new => patch


Comment:

 To fix this issue,I sent a [https://github.com/ghc/ghc/pull/138 pull-
 request] to the Github repository.

 As mentioned in the original ticket #3234, the issue was that the rule
 `fold/build` no longer fired.
 Hence it's sufficient to check only on the availability of this rule in
 the output.

 A more sophisticated test could check on:
 {{{
 5 RuleFired
     1 ++
     1 augment/build
     1 foldr/single
     1 unpack
     1 unpack-list
 }}}
 However this would nedd the grep alternative `grep 'foo\|bar` which is
 part of ''extended'' grep.

 Please feel free to request any needed changes to this PR.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15088#comment:3>
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