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JRuby's Ripper omits the :paren s-expression on method definition #813
I see that RIpper implementation is not yet complete (looking at #789). Here's an incompatibility issues with JRuby's Ripper library. The missing :paren s-expression makes it difficult to round-trip source code in the Sorcerer library.
Using MRI Ruby 2.0.0
Notice that the MRI version includes a :parens s-expression wrapping the :params s-expression (in the next to the last line of output). The JRuby version omits the :parens.