merge revision(s) r48111,r48118,r48120: [Backport ruby#10421]

	* vm_method.c (rb_method_entry_make): warn redefinition only for
	  already defined methods, but not for undefined methods.
	  [ruby-dev:48691] [Bug ruby#10421]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@48138 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: nagachika

ChangeLog

@@ -1,3 +1,9 @@
+Sun Oct 26 03:31:46 2014  Nobuyoshi Nakada  <[email protected]>
+
+	* vm_method.c (rb_method_entry_make): warn redefinition only for
+	  already defined methods, but not for undefined methods.
+	  [ruby-dev:48691] [Bug #10421]
+
 Sun Oct 26 03:21:30 2014  Nobuyoshi Nakada  <[email protected]>
 
 	* class.c (unknown_keyword_error): delete expected keywords

test/ruby/test_object.rb

@@ -298,6 +298,15 @@ def (Object.new).object_id; end
       $VERBOSE = false
       def (Object.new).__send__; end
     INPUT
+
+    bug10421 = '[ruby-dev:48691] [Bug #10421]'
+    assert_in_out_err([], <<-INPUT, ["1"], [], bug10421)
+      $VERBOSE = false
+      class C < BasicObject
+        def object_id; 1; end
+      end
+      puts C.new.object_id
+    INPUT
   end
 
   def test_remove_method

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.1.4"
 #define RUBY_RELEASE_DATE "2014-10-26"
-#define RUBY_PATCHLEVEL 263
+#define RUBY_PATCHLEVEL 264
 
 #define RUBY_RELEASE_YEAR 2014
 #define RUBY_RELEASE_MONTH 10

vm_method.c

@@ -181,6 +181,7 @@ rb_free_method_entry(rb_method_entry_t *me)
     xfree(me);
 }
 
+static inline rb_method_entry_t *search_method(VALUE klass, ID id, VALUE *defined_class_ptr);
 static int rb_method_definition_eq(const rb_method_definition_t *d1, const rb_method_definition_t *d2);
 
 static inline rb_method_entry_t *
@@ -355,7 +356,7 @@ rb_method_entry_make(VALUE klass, ID mid, rb_method_type_t type,
     }
     /* check mid */
     if (mid == object_id || mid == id__send__) {
-	if (type == VM_METHOD_TYPE_ISEQ) {
+	if (type == VM_METHOD_TYPE_ISEQ && search_method(klass, mid, 0)) {
 	    rb_warn("redefining `%s' may cause serious problems", rb_id2name(mid));
 	}
     }