diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t01.dart b/LanguageFeatures/nnbd/exports_A01_functions_t01.dart
index b25094e..c528aa1 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t01.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t01.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t02.dart b/LanguageFeatures/nnbd/exports_A01_functions_t02.dart
index 439b9a5..b91c5d9 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t02.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t02.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t03.dart b/LanguageFeatures/nnbd/exports_A01_functions_t03.dart
index 52c7515..be43b41 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t03.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t03.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t04.dart b/LanguageFeatures/nnbd/exports_A01_functions_t04.dart
index c1342e1..2c4ec67 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t04.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t05.dart b/LanguageFeatures/nnbd/exports_A01_functions_t05.dart
index 5935885..146874e 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t05.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t05.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t06.dart b/LanguageFeatures/nnbd/exports_A01_functions_t06.dart
index 254c028..a639cde 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t06.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t06.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t07.dart b/LanguageFeatures/nnbd/exports_A01_functions_t07.dart
index 35852f2..36657e7 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t07.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t07.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t08.dart b/LanguageFeatures/nnbd/exports_A01_functions_t08.dart
index ec28396..9237de3 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t08.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t08.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t09.dart b/LanguageFeatures/nnbd/exports_A01_functions_t09.dart
index e702efe..c4cfa41 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t09.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t09.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t10.dart b/LanguageFeatures/nnbd/exports_A01_functions_t10.dart
index 80c7dfd..47c880a 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t10.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t10.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t11.dart b/LanguageFeatures/nnbd/exports_A01_functions_t11.dart
index 08dbb07..52e07a2 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t11.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t11.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t12.dart b/LanguageFeatures/nnbd/exports_A01_functions_t12.dart
index 6217602..46eef9e 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t12.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t12.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t13.dart b/LanguageFeatures/nnbd/exports_A01_functions_t13.dart
index a72f159..b16c514 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t13.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t13.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t14.dart b/LanguageFeatures/nnbd/exports_A01_functions_t14.dart
index 6be561f..1479970 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t14.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t14.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_functions_t15.dart b/LanguageFeatures/nnbd/exports_A01_functions_t15.dart
index 19a35e5..0a24b1d 100644
--- a/LanguageFeatures/nnbd/exports_A01_functions_t15.dart
+++ b/LanguageFeatures/nnbd/exports_A01_functions_t15.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_typedef_t01.dart b/LanguageFeatures/nnbd/exports_A01_typedef_t01.dart
index 454a5a9..8447063 100644
--- a/LanguageFeatures/nnbd/exports_A01_typedef_t01.dart
+++ b/LanguageFeatures/nnbd/exports_A01_typedef_t01.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_typedef_t02.dart b/LanguageFeatures/nnbd/exports_A01_typedef_t02.dart
index 01c7d1f..77f348f 100644
--- a/LanguageFeatures/nnbd/exports_A01_typedef_t02.dart
+++ b/LanguageFeatures/nnbd/exports_A01_typedef_t02.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_typedef_t03.dart b/LanguageFeatures/nnbd/exports_A01_typedef_t03.dart
index fe4ffc2..a98dc1c 100644
--- a/LanguageFeatures/nnbd/exports_A01_typedef_t03.dart
+++ b/LanguageFeatures/nnbd/exports_A01_typedef_t03.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_typedef_t04.dart b/LanguageFeatures/nnbd/exports_A01_typedef_t04.dart
index 556fa70..bac4a6b 100644
--- a/LanguageFeatures/nnbd/exports_A01_typedef_t04.dart
+++ b/LanguageFeatures/nnbd/exports_A01_typedef_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_typedef_t05.dart b/LanguageFeatures/nnbd/exports_A01_typedef_t05.dart
index 9ddf2ce..f989679 100644
--- a/LanguageFeatures/nnbd/exports_A01_typedef_t05.dart
+++ b/LanguageFeatures/nnbd/exports_A01_typedef_t05.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_typedef_t06.dart b/LanguageFeatures/nnbd/exports_A01_typedef_t06.dart
index e04941c..bd3af4d 100644
--- a/LanguageFeatures/nnbd/exports_A01_typedef_t06.dart
+++ b/LanguageFeatures/nnbd/exports_A01_typedef_t06.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_typedef_t07.dart b/LanguageFeatures/nnbd/exports_A01_typedef_t07.dart
index 3411706..104d267 100644
--- a/LanguageFeatures/nnbd/exports_A01_typedef_t07.dart
+++ b/LanguageFeatures/nnbd/exports_A01_typedef_t07.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_typedef_t08.dart b/LanguageFeatures/nnbd/exports_A01_typedef_t08.dart
index 8af7bd4..be0d1e9 100644
--- a/LanguageFeatures/nnbd/exports_A01_typedef_t08.dart
+++ b/LanguageFeatures/nnbd/exports_A01_typedef_t08.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_var_t01.dart b/LanguageFeatures/nnbd/exports_A01_var_t01.dart
index 3d81ed6..3cad4f1 100644
--- a/LanguageFeatures/nnbd/exports_A01_var_t01.dart
+++ b/LanguageFeatures/nnbd/exports_A01_var_t01.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_var_t02.dart b/LanguageFeatures/nnbd/exports_A01_var_t02.dart
index 1524f5e..a4d1d52 100644
--- a/LanguageFeatures/nnbd/exports_A01_var_t02.dart
+++ b/LanguageFeatures/nnbd/exports_A01_var_t02.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_var_t03.dart b/LanguageFeatures/nnbd/exports_A01_var_t03.dart
index b7e7945..a01bb42 100644
--- a/LanguageFeatures/nnbd/exports_A01_var_t03.dart
+++ b/LanguageFeatures/nnbd/exports_A01_var_t03.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_A01_var_t04.dart b/LanguageFeatures/nnbd/exports_A01_var_t04.dart
index 7a2ff3d..c64e061 100644
--- a/LanguageFeatures/nnbd/exports_A01_var_t04.dart
+++ b/LanguageFeatures/nnbd/exports_A01_var_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_legacy_lib.dart b/LanguageFeatures/nnbd/exports_legacy_lib.dart
index aea81c2..b9e7d66 100644
--- a/LanguageFeatures/nnbd/exports_legacy_lib.dart
+++ b/LanguageFeatures/nnbd/exports_legacy_lib.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/exports_opted_in_lib.dart b/LanguageFeatures/nnbd/exports_opted_in_lib.dart
index aaf5e88..c561648 100644
--- a/LanguageFeatures/nnbd/exports_opted_in_lib.dart
+++ b/LanguageFeatures/nnbd/exports_opted_in_lib.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t02.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t02.dart
index f8479c1..a1fc3ee 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t02.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t02.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t03.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t03.dart
index 8ef85cf..2eacebb 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t03.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t03.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t04.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t04.dart
index 2eefa12..aa05b07 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t04.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t08.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t08.dart
index 89b00bf..5233f4c 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t08.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t08.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t09.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t09.dart
index 026f29e..00f8d5b 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t09.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t09.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t10.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t10.dart
index c722428..b8a6ebe 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t10.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t10.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t11.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t11.dart
index 1468d73..9030771 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t11.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t11.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t12.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t12.dart
index 9b90b2d..d4403dd 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t12.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t12.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t13.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t13.dart
index de2f0d7..ca51406 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t13.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t13.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t15.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t15.dart
index cb2d977..3e74de0 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t15.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t15.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t16.dart b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t16.dart
index cb5131a..a43aca0 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_ARGS_t16.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_ARGS_t16.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t01.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t01.dart
index 4462d0c..372fdd9 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t01.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t01.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t03.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t03.dart
index a29c41b..8a323c7 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t03.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t03.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t04.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t04.dart
index 82d9270..c4af116 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t04.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t05.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t05.dart
index 31e9374..dd9d77f 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t05.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t05.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t06.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t06.dart
index 8ccd4a4..c1e24a4 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t06.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t06.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t07.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t07.dart
index 2071c1f..7941d68 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t07.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t07.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t08.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t08.dart
index 5aed95c..e12bd49 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t08.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t08.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t09.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t09.dart
index 7dac96a..e31a4ac 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t09.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t09.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t11.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t11.dart
index 2ef0ed0..03c446d 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t11.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t11.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t12.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t12.dart
index d6580f3..f9a75b8 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t12.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t12.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t13.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t13.dart
index 3dc2e23..6a02614 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t13.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t13.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t14.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t14.dart
index 8d84969..f765441 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t14.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t14.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t15.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t15.dart
index dfde4eb..d0b865d 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t15.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t15.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t16.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t16.dart
index 9d8fa3c..25939df 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t16.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t16.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t17.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t17.dart
index f9f475d..09c55c8 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t17.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t17.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t18.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t18.dart
index 4c86213..7bc8c55 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t18.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t18.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t19.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t19.dart
index 5611039..8a036f3 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t19.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t19.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t20.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t20.dart
index 4b43647..431fb24 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t20.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t20.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t21.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t21.dart
index 82a7dc8..f992e28 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t21.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t21.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t23.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t23.dart
index b99e967..8fe2820 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t23.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t23.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t24.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t24.dart
index 90f5125..db5fbb2 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t24.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t24.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t25.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t25.dart
index 42f216c..0e123cb 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t25.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t25.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t26.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t26.dart
index 25e14c3..60b8039 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t26.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t26.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t27.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t27.dart
index f72f3b9..7374d3c 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t27.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t27.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t28.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t28.dart
index c295a2f..c399d34 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t28.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t28.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t29.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t29.dart
index a68d25a..69c105d 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t29.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t29.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t30.dart b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t30.dart
index b6406ca..4162490 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t30.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_CLASSPARAM_t30.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t03.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t03.dart
index 543da52..d39c960 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t03.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t03.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t04.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t04.dart
index 3f8c957..e6a689c 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t04.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t05.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t05.dart
index 5916ea1..5bbed7f 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t05.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t05.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t06.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t06.dart
index 8305346..9bf8435 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t06.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t06.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t07.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t07.dart
index b2a85f2..ace2040 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t07.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t07.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t08.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t08.dart
index f661eca..4ae200d 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t08.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t08.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t09.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t09.dart
index 1fbb5cf..48a67ce 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t09.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t09.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t11.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t11.dart
index 5de7f5f..b5790ea 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t11.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t11.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t12.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t12.dart
index aea20f8..67a41be 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t12.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t12.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t16.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t16.dart
index 5ede480..37f54a3 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t16.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t16.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t17.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t17.dart
index 957e96f..042f769 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t17.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t17.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t18.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t18.dart
index 11bcb5a..a57f8ab 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t18.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t18.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t21.dart b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t21.dart
index 200b190..37e6dc2 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_FIELD_t21.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_FIELD_t21.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t02.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t02.dart
index adf44ca..0d92d22 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t02.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t02.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t03.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t03.dart
index 41426ba..8e9b80e 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t03.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t03.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t04.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t04.dart
index 9839c8e..8d42b26 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t04.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t06.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t06.dart
index c4351ee..84e1346 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t06.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t06.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t07.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t07.dart
index 1ede593..f1f98ac 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t07.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t07.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t08.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t08.dart
index 57dcd34..742c3c1 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t08.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t08.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t09.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t09.dart
index f1eea58..2c08e72 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t09.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t09.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t10.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t10.dart
index ca4e3e6..f475aa0 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t10.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t10.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t11.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t11.dart
index 1e88102..356ce41 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t11.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t11.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t12.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t12.dart
index 086bd92..24f1b07 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t12.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t12.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t13.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t13.dart
index 8f052ef..a2f67e6 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t13.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t13.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t14.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t14.dart
index c9c7220..bc9e0c2 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t14.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t14.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t15.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t15.dart
index 32bfc36..4d36e8e 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t15.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t15.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t16.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t16.dart
index 8bab1c7..64b8b98 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t16.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t16.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t17.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t17.dart
index 426d181..2ebcdac 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t17.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t17.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t18.dart b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t18.dart
index 8f6851b..a676ac1 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_GETTER_t18.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_GETTER_t18.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t04.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t04.dart
index 257ff09..156b2a0 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t04.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t05.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t05.dart
index 9d0378d..5c1eee9 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t05.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t05.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t06.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t06.dart
index 2df7ce5..9e76324 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t06.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t06.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t07.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t07.dart
index 8cb5d3c..32a5545 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t07.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t07.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t08.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t08.dart
index e29fb71..2cc46da 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t08.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t08.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t09.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t09.dart
index 4fc1ebd..3df1490 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t09.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t09.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t10.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t10.dart
index 73fccfe..4fb1cae 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t10.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t10.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t11.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t11.dart
index c06612e..6a67a08 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t11.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t11.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t12.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t12.dart
index 04aa0e8..575f385 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t12.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t12.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t13.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t13.dart
index bfe1403..97066de 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t13.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t13.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t14.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t14.dart
index 4119697..8fe8383 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t14.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t14.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t15.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t15.dart
index 83bbf28..60a7087 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t15.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t15.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t16.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t16.dart
index c2ef88a..1cc0877 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t16.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t16.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t17.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t17.dart
index c37f9bd..6a4b4e3 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t17.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t17.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t21.dart b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t21.dart
index 9da9c7a..73f12b3 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t21.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_REQ_ARGS_t21.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t01.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t01.dart
index ad7a3ee..165b383 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t01.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t01.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t02.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t02.dart
index 2d49fe9..6497675 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t02.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t02.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t03.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t03.dart
index ea863fa..15c5e1f 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t03.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t03.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t04.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t04.dart
index 6562589..3b9cc83 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t04.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t05.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t05.dart
index 90d0c22..cc6b298 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t05.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t05.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t06.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t06.dart
index bad7958..b424679 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t06.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t06.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t08.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t08.dart
index 3543234..0e3dfa7 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t08.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t08.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t09.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t09.dart
index be3e3c4..f6edbfa 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t09.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t09.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t10.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t10.dart
index 9033fab..faf6d0b 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t10.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t10.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t11.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t11.dart
index 909d0d6..034569c 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t11.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t11.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t12.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t12.dart
index 8435ccd..7ece3dc 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t12.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t12.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t14.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t14.dart
index 8eb0759..521f73d 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t14.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t14.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t16.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t16.dart
index f6843b5..846970d 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t16.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t16.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t18.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t18.dart
index 434da34..186d86c 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t18.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t18.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t01.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t01.dart
index 9444dc8..8532db6 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t01.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t01.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t02.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t02.dart
index ddbe227..a9e91e7 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t02.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t02.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t03.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t03.dart
index b7025a7..3d0eaff 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t03.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t03.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t04.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t04.dart
index 82e22e2..fff5c5a 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t04.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t04.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t06.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t06.dart
index d9b036e..8aa9334 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t06.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t06.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t09.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t09.dart
index da75f02..f2fbaa7 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t09.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t09.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t10.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t10.dart
index 08b81e2..450f579 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t10.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t10.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t11.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t11.dart
index fde7f3c..88686ef 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t11.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t11.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t12.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t12.dart
index 7b8dac3..5d5e03f 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t12.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t12.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t13.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t13.dart
index 8cdca88..ead08c4 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t13.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t13.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t14.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t14.dart
index 33acc5b..38d161c 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t14.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t14.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t15.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t15.dart
index 256a030..e2a27b3 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t15.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t15.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t16.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t16.dart
index afcde28..ee6dee3 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t16.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t16.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t17.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t17.dart
index d4bf7d2..fca8876 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t17.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t17.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t18.dart b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t18.dart
index 9af2cdb..1fe07cb 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_SETTER_t18.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_SETTER_t18.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
diff --git a/LanguageFeatures/nnbd/override_checking_opted_in_futureor_lib.dart b/LanguageFeatures/nnbd/override_checking_opted_in_futureor_lib.dart
index 664649c..3841bf2 100644
--- a/LanguageFeatures/nnbd/override_checking_opted_in_futureor_lib.dart
+++ b/LanguageFeatures/nnbd/override_checking_opted_in_futureor_lib.dart
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+ * Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */