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Thomas Haller authored
We should not violate the global data to track the output data while it is constructed and printed. Most of the time, we actually clear the output data anyway -- either before constructing it, or after printing it. In some cases we didn't, but I think that is a bug. It's really hard to keep track of this. The output data should belong to a certain scope and get destroyed afterwards. Passing it around is very confusing. Don't do that.
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