wtf ruby

wtf.rb

class Lol
  def initialize(some_array)
    @some_array = some_array
  end

  def lol
    puts some_array.inspect # returns value
    some_array += [1] # undefined method `+' for nil:NilClass (NoMethodError)
  end

  attr_accessor :some_array
end

Lol.new([1,2,3]).lol

Change to self.some_array and things are sane.