Workaround issue 8080:

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 1485 matching lines @@
     if (hasDynamicTypeError) {
       // TODO(ahe): Remove this warning when co19 no longer uses this tag.
 
       // @dynamic-type-error has been replaced by tests that use
       // tests/co19/src/Utils/dynamic_check.dart to dynamically detect
       // if a test is running in checked mode or not and change its
       // expectations accordingly.
 
       // Using stderr.writeString to avoid breaking dartc/junit_tests
       // which parses the output of the --list option.
-      stderr.writeln(
-          "Warning: deprecated @dynamic-type-error tag used in $filePath");
+
+      // Removed the print below. Tracking of this should be done in the bug
+      // and not in the developer's terminals.
+      // stderr.writeln(
+      //    "Warning: deprecated @dynamic-type-error tag used in $filePath");
     }
 
     return {
       "vmOptions": <List>[[]],
       "dartOptions": null,
       "packageRoot": null,
       "hasCompileError": hasCompileError,
       "hasRuntimeError": hasRuntimeError,
       "isStaticClean" : !hasStaticWarning,
       "otherScripts": <String>[],
@@ skipping 442 matching lines @@
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
  * $compileErrorSkip tests are skipped on browsers due to compile-time error
 """;
     print(report);
    }
 }