I know this works

proc = Proc.new do
  puts self.hi + ' world'
end

class Usa
  def hi
    "Hello!"
  end
end
Usa.new.instance_eval &proc

However I want to pass arguments to proc. So I tried this which does not work. Can anyone help me make following work.

proc = Proc.new do |greeting| 
  puts self.hi + gretting
end

class Usa
  def hi
    "Hello!"
  end
end
Usa.new.instance_eval &proc, 'world' # does not work
Usa.new.instance_eval &proc('world') # does not work