Github user blackdrag commented on the pull request:
https://github.com/apache/groovy/commit/068ce3d445d0b5ce5c77517acb86e4cc11648b3b#commitcomment-25079300
In src/main/org/codehaus/groovy/classgen/AsmClassGenerator.java:
In src/main/org/codehaus/groovy/classgen/AsmClassGenerator.java on line 303:
doable, yes. But then you need to dup before the IFNULL of course and "at
the end of the if", you have to ensure to put it back on the stack since
otherwise you will get a problem with differing stack lengths and the JVM might
reject the code
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