When parsing multiple input files, shallow copies of EMPTY_RESULT cannot
be used for any file after the first one would end up modifying shared
data structures.
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When parsing multiple input files, shallow copies of EMPTY_RESULT cannot be used for any file after the first one would end up modifying shared data structures.
By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.