diff --git a/TestSuite/generics38.pas b/TestSuite/generics38.pas
new file mode 100644
index 000000000..cbf8f648f
--- /dev/null
+++ b/TestSuite/generics38.pas
@@ -0,0 +1,42 @@
+type
+  Comp1 = class(System.Collections.Generic.EqualityComparer<byte>)
+    
+    public function Equals(x, y: byte): boolean; override :=
+    x = y;
+    
+    public function GetHashCode(obj: byte): integer; override :=
+    obj.GetHashCode;
+    
+  end;
+  
+  t0 = class end;
+  
+ 
+  Comp2 = class(System.Collections.Generic.EqualityComparer<t0>)
+    
+    public function Equals(x, y: t0): boolean; override :=
+    x = y;
+    
+    public function GetHashCode(obj: t0): integer; override :=
+    obj.GetHashCode;
+    
+  end;
+  
+  Comp<T> = class(System.Collections.Generic.EqualityComparer<T>)
+    
+    public function Equals(x, y: T): boolean; override :=
+    x = y;
+    
+    public function GetHashCode(obj: T): integer; override :=
+    obj.GetHashCode;
+    
+  end;
+  
+begin 
+  var o := new Comp2;
+  var t0obj := new t0;
+  assert(o.Equals(new t0, new t0) = false);
+  assert(o.Equals(t0obj, t0obj));
+  var o2 := new Comp<integer>;
+  assert(o2.Equals(2, 2));
+end.
\ No newline at end of file
diff --git a/TreeConverter/NetWrappers/NetHelper.cs b/TreeConverter/NetWrappers/NetHelper.cs
index f4a37371e..e015ff094 100644
--- a/TreeConverter/NetWrappers/NetHelper.cs
+++ b/TreeConverter/NetWrappers/NetHelper.cs
@@ -1388,7 +1388,7 @@ namespace PascalABCCompiler.NetHelper
             }
             common_type_node curr_type = SystemLibrary.SystemLibrary.syn_visitor.context.converted_type;
             compiled_type_node comp_node = compiled_type_node.get_type_node(mi.DeclaringType);
-            return curr_type != null && type_table.is_derived(comp_node, curr_type);
+            return curr_type != null && type_table.is_derived(comp_node, curr_type, true);
         }
 		
         public static List<SymbolInfo> GetConstructor(Type t)
diff --git a/TreeConverter/TreeRealization/generics.cs b/TreeConverter/TreeRealization/generics.cs
index f41a373ef..e52d04b13 100644
--- a/TreeConverter/TreeRealization/generics.cs
+++ b/TreeConverter/TreeRealization/generics.cs
@@ -1333,6 +1333,7 @@ namespace PascalABCCompiler.TreeRealization
                     }
                 }
             }
+            
             return false;
         }
 
diff --git a/TreeConverter/TreeRealization/type_table.cs b/TreeConverter/TreeRealization/type_table.cs
index d2397bd2d..676923ddc 100644
--- a/TreeConverter/TreeRealization/type_table.cs
+++ b/TreeConverter/TreeRealization/type_table.cs
@@ -345,13 +345,15 @@ namespace PascalABCCompiler.TreeRealization
             }
         }
 
-        public static bool is_derived(type_node base_class, type_node derived_class)
+        public static bool is_derived(type_node base_class, type_node derived_class, bool ignore_generic_instances=false)
         {
             if (derived_class == null)  //void?
                 return false;
             if (base_class == null)
                 return false;
             type_node tn = derived_class.base_type;
+            if (tn is compiled_generic_instance_type_node && ignore_generic_instances)
+                tn = tn.original_generic;
             //TODO: Проверить на ссылочный и размерный тип.
             if (derived_class.semantic_node_type == semantic_node_type.null_type_node)
                 if (is_with_nil_allowed(base_class) || base_class.IsPointer)