На 1.9.3p0 (2011-10-30 revision 33570) irb(main):002:0> OpenStruct.new(method:'foobar').method Ar

На 1.9.3p0 (2011-10-30 revision 33570)

irb(main):002:0> OpenStruct.new(method:'foobar').method
ArgumentError: wrong number of arguments(0 for 1)
from (irb):2:in `method'
from (irb):2
from /usr/local/bin/irb:12:in `<main>'

Охохо.
:(

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