MacRuby bug with #method.call and blocks

blocks.rb

class Foo
  def bar
    if block_given?
      yield
    else
      puts "Foo#bar: please give me a block :("
    end
  end
end

Foo.new.method(:bar).call() { puts "in the block 1" }
Foo.new.method(:bar).call( &Proc.new { puts "in the block 2" } )

=begin

Running the above code under MRI and MacRuby

→ ruby blocks.rb
in the block 1
in the block 2

→ macruby blocks.rb
Foo#bar: please give me a block :(
Foo#bar: please give me a block :(

=end