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(andrew) Replace several fragile try/finally blocks in merge.py using
        bzrlib.cleanup. (#517275)

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bzrlib/cleanup.py
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If you want to be certain that the first, and only the first, error is raised,
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then use::
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    operation = OperationWithCleanups(lambda operation: do_something())
 
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    operation = OperationWithCleanups(do_something)
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    operation.add_cleanup(cleanup_something)
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    operation.run()
 
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    operation.run_simple()
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This is more inconvenient (because you need to make every try block a
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function), but will ensure that the first error encountered is the one raised,