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add NEWS about _1 as a local variable [ci skip]

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卜部昌平 2019-11-12 16:15:58 +09:00
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@ -126,6 +126,11 @@ sufficient information, see the ChangeLog file or Redmine
[1, 2, 10].map { _1.to_s(16) } #=> ["1", "2", "a"]
You can still define a local variable named _1 and so on, and that is honored when present, but renders warning.
_1 = 0
[1].each { p _1 } # prints 0 instead of 1, but also warns.
==== proc/lambda without block is deprecated
* Proc.new and Kernel#proc with no block in a method called with a block is