https://git.ruby-lang.org/ruby.git/commit/?id=5a62fb1277

From 5a62fb1277fb351a1a11b89b0f8510c8f1a0cdff Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 24 Dec 2019 11:14:13 +0900
Subject: Mentioned `-W:` command option in NEWS [ci skip]


diff --git a/NEWS b/NEWS
index c34ffae..e6b6351 100644
--- a/NEWS
+++ b/NEWS
@@ -236,6 +236,30 @@ sufficient information, see the ChangeLog file or Redmine https://github.com/ruby/ruby/blob/trunk/NEWS#L236
 
 * Refinements take place at Object#method and Module#instance_method. [Feature #15373]
 
+* Command line option +-W+ has been extended with a following +:+, to manage categorized
+  warnings.  [Feature #16345]  [Feature #16420]
+
+    # deprecation warning
+    $ ruby -e '$; = ""'
+    -e:1: warning: `$;' is deprecated
+
+    # suppress the deprecation warning
+    $ ruby -W:no-deprecated -e '$; = //'
+
+    # works with RUBYOPT environment variable
+    $ RUBYOPT=-W:no-deprecated ruby -e '$; = //'
+
+    # experimental feature warning
+    $ ruby -e '0 in a'
+    -e:1: warning: Pattern matching is experimental, and the behavior may change in future versions of Ruby!
+
+    # suppress experimental feature warning
+    $ ruby -W:no-experimental -e '0 in a'
+
+    # suppress both by using RUBYOPT
+    $ RUBYOPT='-W:no-deprecated -W:no-experimental' ruby -e '($; = "") in a'
+
+
 === Core classes updates (outstanding ones only)
 
 Array::
@@ -504,7 +528,7 @@ Warning:: https://github.com/ruby/ruby/blob/trunk/NEWS#L528
   New methods::
 
     * Added Warning.[] and Warning.[]= to manage emit/suppress of
-      some categories of warnings.  [Feature #16345]
+      some categories of warnings.  [Feature #16345] [Feature #16420]
 
 $LOAD_PATH::
 
-- 
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