backtrace on canceled test

New submission from robertc <[email protected]>:

I hit control-C while running tests in trial.

While trial should stop on control-C, a backtrace isn't that useful. I'd suggest that:
 - the current test have a failure with the exception I caused logged
 - the test suite stop immediately
 - control return to the consol.e


  File "/usr/bin/trial", line 24, in <module>
    run()
  File "/usr/lib/python2.6/dist-packages/twisted/scripts/trial.py", line 361, in run
    test_result = trialRunner.run(suite)
  File "/usr/lib/python2.6/dist-packages/twisted/trial/runner.py", line 813, in run
    return self._runWithoutDecoration(test)
  File "/usr/lib/python2.6/dist-packages/twisted/trial/runner.py", line 839, in _runWithoutDecoration
    run()
  File "/usr/lib/python2.6/dist-packages/twisted/trial/runner.py", line 834, in <lambda>
    run = lambda: suite.run(result)
  File "/usr/lib/python2.6/dist-packages/twisted/trial/runner.py", line 291, in run
    TestSuite.run(self, result)
  File "/usr/lib/python2.6/dist-packages/twisted/trial/unittest.py", line 1496, in run


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Type     : defect
Component: trial
Keywords : 
Priority : normal
Nosy     : 
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http://twistedmatrix.com/trac/ticket/3975