memo:

#ブロックスコープなのかしら。
bar = "aa"
bar.inspect # => "\"aa\""
1.times do |;bar| # !> shadowing outer local variable - bar
		bar.inspect # => "nil"
	  bar = "bb"
		bar.inspect # => "\"bb\""
end
bar.inspect # => "\"aa\""
1.times do 
		bar.inspect # => "\"aa\""
	  bar = "bb"
		bar.inspect # => "\"bb\""
end
bar.inspect # => "\"bb\""