diff --git a/TestSuite/errors/err0519_format_string.pas b/TestSuite/errors/err0519_format_string.pas
index 0b89595c4..09b8ed341 100644
--- a/TestSuite/errors/err0519_format_string.pas
+++ b/TestSuite/errors/err0519_format_string.pas
@@ -1,3 +1,4 @@
-begin
+//!Встречена неправильная форматная строка
+begin
   var s := $'{{{';
 end.
\ No newline at end of file
diff --git a/TestSuite/errors/err0520_override_reintroduce.pas b/TestSuite/errors/err0520_override_reintroduce.pas
new file mode 100644
index 000000000..4f510de3f
--- /dev/null
+++ b/TestSuite/errors/err0520_override_reintroduce.pas
@@ -0,0 +1,12 @@
+//!Совместное использование модификаторов override и reintroduce недопустимо
+type
+  c1 = abstract class
+    procedure p1; abstract;
+  end;
+
+  c2 = class (c1)
+    procedure p1; reintroduce; override;  
+    begin end;
+  end;
+
+begin end.
\ No newline at end of file
diff --git a/TestSuite/errors/err0521_override_reintroduce.pas b/TestSuite/errors/err0521_override_reintroduce.pas
new file mode 100644
index 000000000..6854d9361
--- /dev/null
+++ b/TestSuite/errors/err0521_override_reintroduce.pas
@@ -0,0 +1,12 @@
+//!Совместное использование модификаторов override и reintroduce недопустимо
+type
+  c1 = abstract class
+    procedure p1; abstract;
+  end;
+
+  c2 = class (c1)
+    procedure p1; override;reintroduce;   
+    begin end;
+  end;
+
+begin end.
\ No newline at end of file
diff --git a/TreeConverter/TreeConversion/syntax_tree_visitor.cs b/TreeConverter/TreeConversion/syntax_tree_visitor.cs
index 0302830a2..1de65161c 100644
--- a/TreeConverter/TreeConversion/syntax_tree_visitor.cs
+++ b/TreeConverter/TreeConversion/syntax_tree_visitor.cs
@@ -14078,9 +14078,11 @@ namespace PascalABCCompiler.TreeConverter
             bool is_override = false;
             bool is_virtual = false;
             bool is_abstract = false;
+            bool is_reintroduce = false;
             string override_proc_attr=null;
             string virtual_proc_attr=null;
             string abstract_proc_attr = null;
+            string reintroduce_proc_attr = null;
             for (int i = 0; i < _procedure_attributes_list.proc_attributes.Count; i++)
             {
                 switch (_procedure_attributes_list.proc_attributes[i].attribute_type)
@@ -14103,6 +14105,12 @@ namespace PascalABCCompiler.TreeConverter
                             virtual_proc_attr = _procedure_attributes_list.proc_attributes[i].name;
                         }
                         break;
+                    case SyntaxTree.proc_attribute.attr_reintroduce:
+                        {
+                            is_reintroduce = true;
+                            reintroduce_proc_attr = _procedure_attributes_list.proc_attributes[i].name;
+                        }
+                        break;
                 }
             }
             context.top_function.is_overload = true;                                       // SSM 12/08/15
@@ -14221,6 +14229,10 @@ namespace PascalABCCompiler.TreeConverter
                 			{
                             	AddError(get_location(_procedure_attributes_list.proc_attributes[i]),"USING_MODIFIERS{0}_{1}_TOGETHER_NOT_ALLOWED", _procedure_attributes_list.proc_attributes[i].name,virtual_proc_attr);
                             }
+                            if (_procedure_attributes_list.proc_attributes[i].attribute_type == SyntaxTree.proc_attribute.attr_override && is_reintroduce)
+                            {
+                                AddError(get_location(_procedure_attributes_list.proc_attributes[i]), "USING_MODIFIERS{0}_{1}_TOGETHER_NOT_ALLOWED", _procedure_attributes_list.proc_attributes[i].name, reintroduce_proc_attr);
+                            }
                             if (_procedure_attributes_list.proc_attributes[i].attribute_type == SyntaxTree.proc_attribute.attr_override)
                 			{
                 				is_override = true;