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Can't instance_exec curried proc in JRuby?

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gistfile1.rb
Ruby
1 2 3 4 5
foo = lambda { |x, y| x + y }
instance_exec 1, 2, &foo # => 3
 
bar = foo.curry.call(1)
instance_exec 2, &bar # NameError: undefined local variable or method `arity' for main:Object

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