[ruby-core:35386] Regression of __method__ on 1.9

As found on:

http://stackoverflow.com/questions/5129798

class Testing
  [:one, :two].each do |name|
    define_method(name) do
      puts __method__
    end
  end
end

t = Testing.new
t.one # => two
t.two # => two

Output is correct in 1.8.7, but not in 1.9.2.