patch 9.1.1264: Vim9: error when comparing objects

Problem:  Vim9: error when comparing objects
          (lifepillar)
Solution: When comparing object types, compare their classes
          (Yegappan Lakshmanan)

fixes: #17014
closes: #17018

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_vim9_class.vim

@@ -12481,4 +12481,44 @@ def Test_super_keyword()
   v9.CheckSourceSuccess(lines)
 enddef
 
+" Test for using a list of objects
+def Test_method_call_from_list_of_objects()
+  var lines =<< trim END
+    vim9script
+
+    class C
+      def F(): string
+        return 'C.F'
+      enddef
+    endclass
+
+  class D
+    var x: string
+    def new(this.x)
+    enddef
+    def F(): string
+      return 'D.F'
+    enddef
+  endclass
+
+  var obj1 = C.new()
+  var obj2 = D.new('a')
+
+  def CheckObjectList()
+    var items = [obj1, obj2]
+    assert_equal('list<any>', typename(items))
+    assert_equal('C.F', items[0].F())
+    assert_equal('D.F', items[1].F())
+  enddef
+
+  CheckObjectList()
+
+  var items2 = [obj1, obj2]
+  assert_equal('list<any>', typename(items2))
+  assert_equal('C.F', items2[0].F())
+  assert_equal('D.F', items2[1].F())
+  END
+  v9.CheckSourceSuccess(lines)
+enddef
+
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1264,
 /**/
     1263,
 /**/

src/vim9type.c

@@ -1984,10 +1984,12 @@ equal_type(type_T *type1, type_T *type2, int flags)
 	case VAR_JOB:
 	case VAR_CHANNEL:
 	case VAR_INSTR:
-	case VAR_CLASS:
-	case VAR_OBJECT:
 	case VAR_TYPEALIAS:
 	    break;  // not composite is always OK
+	case VAR_OBJECT:
+	case VAR_CLASS:
+	    // Objects are considered equal if they are from the same class
+	    return type1->tt_class == type2->tt_class;
 	case VAR_LIST:
 	case VAR_DICT:
 	    return equal_type(type1->tt_member, type2->tt_member, flags);