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Refinements causes "ArgumentError: tried to create Proc object without a block" #3796
Example code appears to trigger the behaviour in plain jRuby without any gems being required.
I should get the same behaviour in MRI and jRuby -- the example program should not raise ArgumentError.
Also, I can't but think that this is part of the same issue (although I'm happy to raise it as a seperate ticket if someone wants me to):
...and, we run it and we get: