diff --git a/ReleaseGenerators/copyright.txt b/ReleaseGenerators/copyright.txt
index 3a3f9f963..c1d3dc226 100644
--- a/ReleaseGenerators/copyright.txt
+++ b/ReleaseGenerators/copyright.txt
@@ -1 +1 @@
-Copyright (C) 2005-2018 by Ivan Bondarev, Stanislav Mikhalkovich
\ No newline at end of file
+Copyright (C) 2005-2020 by Ivan Bondarev, Stanislav Mikhalkovich
\ No newline at end of file
diff --git a/TestSuite/explicitinterface6.pas b/TestSuite/explicitinterface6.pas
new file mode 100644
index 000000000..d9aa969ec
--- /dev/null
+++ b/TestSuite/explicitinterface6.pas
@@ -0,0 +1,30 @@
+var a: integer;
+
+type
+  I1 = interface
+    
+    procedure p1(i: integer);
+    procedure p1(s: string);
+    
+  end;
+  
+  t1 = class(I1)
+    
+    public procedure I1.p1(i: integer);
+    begin
+      a := 1;
+    end;
+    public procedure I1.p1(s: string);
+    begin
+      a := 2;
+    end;
+    
+  end;
+  
+begin 
+  var o: I1 := new t1;
+  o.p1(2);
+  assert(a = 1);
+  o.p1('');
+  assert(a = 2);
+end.
\ No newline at end of file
diff --git a/TreeConverter/TreeConversion/compilation_context.cs b/TreeConverter/TreeConversion/compilation_context.cs
index 400994795..e2a7ed123 100644
--- a/TreeConverter/TreeConversion/compilation_context.cs
+++ b/TreeConverter/TreeConversion/compilation_context.cs
@@ -2702,7 +2702,7 @@ namespace PascalABCCompiler.TreeConverter
                 else
                 {
                     sil = tmp_si;
-                    sil.RemoveRange(1, sil.Count() - 1);
+                    //sil.RemoveRange(1, sil.Count() - 1);
                 }
             }
 
diff --git a/doc/License_en.txt b/doc/License_en.txt
index d4ea23128..a8829d4c7 100644
--- a/doc/License_en.txt
+++ b/doc/License_en.txt
@@ -3,7 +3,7 @@ A copy of the GNU GPL is appended to this file.
 
 IMPORTANT PascalABC.NET LICENSE TERMS
 
-Copyright (C) 2005-2019 by Ivan Bondarev, Stanislav Mikhalkovich
+Copyright (C) 2005-2020 by Ivan Bondarev, Stanislav Mikhalkovich
 This program is free software; you may redistribute and/or modify it under the terms of the GNU LGPL version 3 with the clarifications and exceptions described below. 
 
 PascalABC.NET can be linked with non-free modules and libraries. This condition is mainly concerned with possibility of adding foreign modules and libraries to PascalABC.NET, aimed at education. In particular, PascalABC.NET includes as a part PROGRAMMING TASKBOOK FOR PASCALABC.NET (in agreement with the author of this product), which is distributed under the terms of proprietary license (see \bin\PT4)
diff --git a/doc/copyright.txt b/doc/copyright.txt
index 9012b983a..c1d3dc226 100644
--- a/doc/copyright.txt
+++ b/doc/copyright.txt
@@ -1 +1 @@
-Copyright (C) 2005-2019 by Ivan Bondarev, Stanislav Mikhalkovich
\ No newline at end of file
+Copyright (C) 2005-2020 by Ivan Bondarev, Stanislav Mikhalkovich
\ No newline at end of file
diff --git a/doc/license.txt b/doc/license.txt
index 1f90bc51b..ad6a51f95 100644
--- a/doc/license.txt
+++ b/doc/license.txt
@@ -3,7 +3,7 @@
 
 ВАЖНЕЙШИЕ УСЛОВИЯ РАСПРОСТРАНЕНИЯ ПРОДУКТА PascalABC.NET
 
-Copyright (C) 2005-2019 by Ivan Bondarev, Stanislav Mikhalkovich
+Copyright (C) 2005-2020 by Ivan Bondarev, Stanislav Mikhalkovich
 Это программное обеспечение является свободным; вы можете распространять и/или 
 модифицировать его на условиях GNU LGPL версии 3 с разъяснениями и исключениями, данными ниже.