Github user bodewig commented on the issue:
https://github.com/apache/ant/pull/58
The changes to `FixCRLF`, `TaskOutputStream`, `VerifyJar`, `Message`,
`TraxLiaison` and `RegexpPatternMapper` all change instance variables of
classes that might be used in a mutlithreaded context. In the case of
`RegexpPatternMapper` they are even protected and thus the change would break
backwards compatibility.
Please restrict your change to `StringBuffer`s created as local variables
in methods that are not returned or passed to multiple threads.
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