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Simple delegator + open = boom
require 'delegate'
class MyOpen
def open
puts 'my open'
my_open =
wrapped = my_open #works
wrapped.send :open # boom on 2.0-p353.. works on 2.1 though
# tobi@speedy:~/Dropbox/Rubyhacking$ ruby open.rb
# my open
# open.rb:13:in `initialize': wrong number of arguments (0 for 1..3) (ArgumentError)
# from open.rb:13:in `open'
# from open.rb:13:in `<main>'

I've never had good experiences shadowing methods from Kernel.

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