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osyo-manga/gist-file0.txt

Created November 24, 2015 04:11
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call_once
Raw
gist-file0.txt
def call_one &block
flag = false
proc { flag || instance_eval(&block); flag = true }
end
class X
define_method(:initialize, &call_one do
p "homu"
end)
end
X.new
X.new
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