object.c: Deprecate Object#=~ and add NilClass#=~`

Object#=~ always returns nil.  This behavior is not only unuseful but
also troublesome because it may hide a type error.

This change deprecates Object#=~.  For compatibility, NilClass#=~ is
newly introduced.  [Feature #15231]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65989 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 115eda0811..189916a04a 100644
--- a/NEWS
+++ b/NEWS
@@ -217,6 +217,12 @@ sufficient information, see the ChangeLog file or Redmine
     * NameError.new accepts +:receiver+ option to set receiver in Ruby
       code.  [Feature #14313]
 
+[NilClass]
+
+  [New methods]
+
+    * NilClass#=~ is added for compatibility.  [Feature #15231]
+
 [NoMethodError]
 
   [New options]
@@ -447,6 +453,10 @@ sufficient information, see the ChangeLog file or Redmine
     File.readlines do not invoke external commands even if the path starts
     with the pipe character <code>'|'</code>. [Feature #14245]
 
+[Object]
+
+  * Object#=~ is deprecated.  [Feature #15231]
+
 === Stdlib compatibility issues (excluding feature bug fixes)
 
 * These standard libraries have been promoted to default gems.