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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