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Created October 11, 2012 20:52
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a.rb
define :factorial, :i => Integer do
if i < 1 then 1 else i * factorial(i - 1) end
end
# => #<Proc:0x00000001aaee10@type_assurance.rb:2 (lambda)>
factorial 5
# => 120
factorial 5.4
# => #<RuntimeError: Error, expected Integer as argument for i in factorial>
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