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madrobby/gist:0caa0a78445f41de422a

Created June 9, 2014 14:24
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gistfile1.rb
irb(main):001:0> A = [1,2,3].freeze
=> [1, 2, 3]
irb(main):002:0> A[2] = 5
TypeError: can't modify frozen array
from (irb):2:in `[]='
from (irb):2
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