Updated an error message to inform users that their packages were not installed

utils/pub/entrypoint.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 entrypoint;
 
 import 'dart:async';
 
 import '../../pkg/pathos/lib/path.dart' as path;
 
@@ skipping 175 matching lines @@
       var errors = [];
 
       for (var pubspec in pubspecs) {
         var sdkConstraint = pubspec.environment.sdkVersion;
         if (!sdkConstraint.allows(sdk.version)) {
           errors.add("- '${pubspec.name}' requires ${sdkConstraint}");
         }
       }
 
       if (errors.length > 0) {
-        log.error("Some packages are not compatible with your SDK version "
-                "${sdk.version}:\n"
+        log.error("Some packages that were installed are not compatible with "
+                "your SDK version ${sdk.version} and may not work:\n"
             "${errors.join('\n')}\n\n"
             "You may be able to resolve this by upgrading to the latest Dart "
                 "SDK\n"
             "or adding a version constraint to use an older version of a "
                 "package.");
       }
     });
   }
 
   /// Loads the list of concrete package versions from the `pubspec.lock`, if it
@@ skipping 85 matching lines @@
 
   /// Creates a symlink to the `packages` directory in [dir] if none exists.
   Future _linkSecondaryPackageDir(String dir) {
     return defer(() {
       var symlink = path.join(dir, 'packages');
       if (entryExists(symlink)) return;
       return createSymlink(packagesDir, symlink, relative: true);
     });
   }
 }