diff --git a/TestSuite/attributes5.pas b/TestSuite/attributes5.pas
new file mode 100644
index 000000000..022379f84
--- /dev/null
+++ b/TestSuite/attributes5.pas
@@ -0,0 +1,17 @@
+uses System;
+
+type 
+  [AttributeUsage(AttributeTargets.Field or AttributeTargets.Property) ]
+  myattr = class (Attribute) end;
+  
+  TClass = class
+    [myattr]
+    a: integer;
+    
+    [myattr]
+    property prop: integer read a;
+    
+  end;
+  
+begin
+end.
\ No newline at end of file
diff --git a/TestSuite/errors/err0518_attributes.pas b/TestSuite/errors/err0518_attributes.pas
new file mode 100644
index 000000000..ebe30ec9d
--- /dev/null
+++ b/TestSuite/errors/err0518_attributes.pas
@@ -0,0 +1,23 @@
+//!Атрибут myattr неприменим к методам
+uses System;
+
+type 
+  [AttributeUsage(AttributeTargets.Field or AttributeTargets.Property) ]
+  myattr = class (Attribute) end;
+  
+  TClass = class
+    [myattr]
+    a: integer;
+    
+    [myattr]
+    property prop: integer read a;
+    
+    [myattr]
+    procedure Test;
+    begin
+      
+    end;
+  end;
+  
+begin
+end.
diff --git a/TreeConverter/SystemLib/static_executors.cs b/TreeConverter/SystemLib/static_executors.cs
index 711f2ce1a..5ec026e62 100644
--- a/TreeConverter/SystemLib/static_executors.cs
+++ b/TreeConverter/SystemLib/static_executors.cs
@@ -5019,6 +5019,75 @@ namespace PascalABCCompiler.SystemLibrary
             return new string_const_node(left.constant_value.ToString() + right.constant_value.ToString(), call_location);
         }
 
+        public static expression_node enum_or_executor(location call_location, params expression_node[] parameters)
+        {
+            enum_const_node left = parameters[0] as enum_const_node;
+            if (left == null && parameters[0] is static_compiled_variable_reference)
+            {
+                static_compiled_variable_reference cvr = parameters[0] as static_compiled_variable_reference;
+                if (cvr.var.IsLiteral)
+                    left = new enum_const_node((int)cvr.var.compiled_field.GetRawConstantValue(), parameters[0].type, parameters[0].location);
+            }
+            if (left == null)
+                return null;
+            enum_const_node right = parameters[1] as enum_const_node;
+            if (right == null && parameters[1] is static_compiled_variable_reference)
+            {
+                static_compiled_variable_reference cvr = parameters[1] as static_compiled_variable_reference;
+                if (cvr.var.IsLiteral)
+                    right = new enum_const_node((int)cvr.var.compiled_field.GetRawConstantValue(), parameters[1].type, parameters[1].location);
+            }
+            if (right == null)
+                return null;
+
+            return new enum_const_node(left.constant_value | right.constant_value, left.type, call_location);
+        }
+
+        public static expression_node enum_and_executor(location call_location, params expression_node[] parameters)
+        {
+            enum_const_node left = parameters[0] as enum_const_node;
+            if (left == null && parameters[0] is static_compiled_variable_reference)
+            {
+                static_compiled_variable_reference cvr = parameters[0] as static_compiled_variable_reference;
+                if (cvr.var.IsLiteral)
+                    left = new enum_const_node((int)cvr.var.compiled_field.GetRawConstantValue(), parameters[0].type, parameters[0].location);
+            }
+            if (left == null)
+                return null;
+            enum_const_node right = parameters[1] as enum_const_node;
+            if (right == null && parameters[1] is static_compiled_variable_reference)
+            {
+                static_compiled_variable_reference cvr = parameters[1] as static_compiled_variable_reference;
+                if (cvr.var.IsLiteral)
+                    right = new enum_const_node((int)cvr.var.compiled_field.GetRawConstantValue(), parameters[1].type, parameters[1].location);
+            }
+            if (right == null)
+                return null;
+            return new enum_const_node(left.constant_value & right.constant_value, left.type, call_location);
+        }
+
+        public static expression_node enum_xor_executor(location call_location, params expression_node[] parameters)
+        {
+            enum_const_node left = parameters[0] as enum_const_node;
+            if (left == null && parameters[0] is static_compiled_variable_reference)
+            {
+                static_compiled_variable_reference cvr = parameters[0] as static_compiled_variable_reference;
+                if (cvr.var.IsLiteral)
+                    left = new enum_const_node((int)cvr.var.compiled_field.GetRawConstantValue(), parameters[0].type, parameters[0].location);
+            }
+            if (left == null)
+                return null;
+            enum_const_node right = parameters[1] as enum_const_node;
+            if (right == null && parameters[1] is static_compiled_variable_reference)
+            {
+                static_compiled_variable_reference cvr = parameters[1] as static_compiled_variable_reference;
+                if (cvr.var.IsLiteral)
+                    right = new enum_const_node((int)cvr.var.compiled_field.GetRawConstantValue(), parameters[1].type, parameters[1].location);
+            }
+            if (right == null)
+                return null;
+            return new enum_const_node(left.constant_value ^ right.constant_value, left.type, call_location);
+        }
     }
 
 }
diff --git a/TreeConverter/TreeConversion/syntax_tree_visitor.cs b/TreeConverter/TreeConversion/syntax_tree_visitor.cs
index 8f15ebdae..343662df7 100644
--- a/TreeConverter/TreeConversion/syntax_tree_visitor.cs
+++ b/TreeConverter/TreeConversion/syntax_tree_visitor.cs
@@ -12496,6 +12496,8 @@ namespace PascalABCCompiler.TreeConverter
                         for (int i = 0; i < cnstr_args.expressions.Count; i++)
                         {
                             constant_node cn = convert_strong_to_constant_node(cnstr_args.expressions[i]);
+                            if (cn is basic_function_call_as_constant && (cn as basic_function_call_as_constant).method_call.function_node.compile_time_executor != null)
+                                cn = (cn as basic_function_call_as_constant).method_call.function_node.compile_time_executor(cn.location, (cn as basic_function_call_as_constant).method_call.parameters.ToArray()) as constant_node;
                             check_for_strong_constant(cn, get_location(cnstr_args.expressions[i]));
                             args.AddElement(cn);
                         }
diff --git a/TreeConverter/TreeRealization/types.cs b/TreeConverter/TreeRealization/types.cs
index 252eb2fbb..73f227261 100644
--- a/TreeConverter/TreeRealization/types.cs
+++ b/TreeConverter/TreeRealization/types.cs
@@ -3340,8 +3340,11 @@ namespace PascalABCCompiler.TreeRealization
         {
             if (ctn.compiled_type.GetCustomAttributes(typeof(FlagsAttribute), true).Length == 0) return;
             basic_function_node _int_and = SystemLibrary.SystemLibrary.make_binary_operator(compiler_string_consts.and_name, ctn, SemanticTree.basic_function_type.iand);
+            _int_and.compile_time_executor = SystemLibrary.static_executors.enum_and_executor;
             basic_function_node _int_or = SystemLibrary.SystemLibrary.make_binary_operator(compiler_string_consts.or_name, ctn, SemanticTree.basic_function_type.ior);
+            _int_or.compile_time_executor = SystemLibrary.static_executors.enum_or_executor;
             basic_function_node _int_xor = SystemLibrary.SystemLibrary.make_binary_operator(compiler_string_consts.xor_name, ctn, SemanticTree.basic_function_type.ixor);
+            _int_xor.compile_time_executor = SystemLibrary.static_executors.enum_xor_executor;
             if (ctn.scope != null)
             {
                 ctn.scope.AddSymbol(compiler_string_consts.and_name, new SymbolInfo(_int_and));