Github user danielsun1106 commented on the pull request: https://github.com/apache/groovy/commit/f88d0122525cabf6bdf61ab051533f9983f352f1#commitcomment-28390941 In src/test/groovy/SerializableCompatibilityTest.groovy: In src/test/groovy/SerializableCompatibilityTest.groovy on line 40: Yep, as its name shows, it is generated by 2.4
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