merge revision(s) 8dfae85adb96cf3da84bf38f2103969d4a7aed3f: [Backport #17575]

	Warn the defined location as deprecation as well as the main message

	[Bug #17575]
	---
	 test/ruby/test_defined.rb | 17 +++++++++++++++++
	 vm_method.c               |  3 ++-
	 2 files changed, 19 insertions(+), 1 deletion(-)

3 files changed, 20 insertions, 2 deletions

diff --git a/test/ruby/test_defined.rb b/test/ruby/test_defined.rb
index b22db700da..73c192a0ae 100644
--- a/test/ruby/test_defined.rb
+++ b/test/ruby/test_defined.rb
@@ -258,6 +258,23 @@ class TestDefined < Test::Unit::TestCase
     assert_separately([], "assert_nil(defined?(super))")
   end
 
+  def test_respond_to
+    obj = "#{self.class.name}##{__method__}"
+    class << obj
+      def respond_to?(mid)
+        true
+      end
+    end
+    assert_warn(/deprecated method signature.*\n.*respond_to\? is defined here/) do
+      Warning[:deprecated] = true
+      defined?(obj.foo)
+    end
+    assert_warn('') do
+      Warning[:deprecated] = false
+      defined?(obj.foo)
+    end
+  end
+
   class ExampleRespondToMissing
     attr_reader :called
 
diff --git a/version.h b/version.h
index bd7503e18e..9a20707c89 100644
--- a/version.h
+++ b/version.h
@@ -12,7 +12,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 0
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 27
+#define RUBY_PATCHLEVEL 28
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 2
diff --git a/vm_method.c b/vm_method.c
index e545146df9..928b509651 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -2493,7 +2493,8 @@ vm_respond_to(rb_execution_context_t *ec, VALUE klass, VALUE obj, ID id, int pri
 		    VALUE path = RARRAY_AREF(location, 0);
 		    VALUE line = RARRAY_AREF(location, 1);
 		    if (!NIL_P(path)) {
-			rb_compile_warn(RSTRING_PTR(path), NUM2INT(line),
+			rb_category_compile_warn(RB_WARN_CATEGORY_DEPRECATED,
+					RSTRING_PTR(path), NUM2INT(line),
 					"respond_to? is defined here");
 		    }
 		}