Get rid of all the library tags.

lib/src/validator/executable.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.
 
-library pub.validator.executable;
-
 import 'dart:async';
 
 import 'package:path/path.dart' as p;
 
 import '../entrypoint.dart';
 import '../validator.dart';
 
 /// Validates that a package's pubspec doesn't contain executables that
 /// reference non-existent scripts.
 class ExecutableValidator extends Validator {
@@ skipping 10 matching lines @@
 
     entrypoint.root.pubspec.executables.forEach((executable, script) {
       var scriptPath = p.join("bin", "$script.dart");
       if (binFiles.contains(scriptPath)) return;
 
       warnings.add('Your pubspec.yaml lists an executable "$executable" that '
           'points to a script "$scriptPath" that does not exist.');
     });
   }
 }