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

utils/tests/pub/sdk_constraint_test.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 check_sdk_test;
 
 import "test_pub.dart";
 import "../../../pkg/unittest/lib/unittest.dart";
 
 main() {
@@ skipping 17 matching lines @@
       dir(appPath, [
         pubspec({
           "name": "myapp",
           "environment": {"sdk": ">2.0.0"}
         })
       ]).scheduleCreate();
 
       schedulePub(args: [command],
           error:
             """
-            Some packages are not compatible with your SDK version 0.1.2+3:
+            Some packages that were installed are not compatible with your SDK version 0.1.2+3 and may not work:
             - 'myapp' requires >2.0.0
 
             You may be able to resolve this by upgrading to the latest Dart SDK
             or adding a version constraint to use an older version of a package.
             """);
     });
 
     integration("gives an error if some dependencies do not match", () {
       // Using an SDK source, but this should be true of all sources.
       dir(sdkPath, [
@@ skipping 16 matching lines @@
             "foo": { "sdk": "foo" },
             "bar": { "sdk": "bar" }
           },
           "environment": {"sdk": ">2.0.0"}
         })
       ]).scheduleCreate();
 
       schedulePub(args: [command],
           error:
             """
-            Some packages are not compatible with your SDK version 0.1.2+3:
+            Some packages that were installed are not compatible with your SDK version 0.1.2+3 and may not work:
             - 'myapp' requires >2.0.0
             - 'foo' requires >0.1.3
 
             You may be able to resolve this by upgrading to the latest Dart SDK
             or adding a version constraint to use an older version of a package.
             """);
     });
 
     integration("gives an error if a transitive dependency doesn't match", () {
       // Using an SDK source, but this should be true of all sources.
@@ skipping 17 matching lines @@
           "name": "myapp",
           "dependencies": {
             "foo": { "sdk": "foo" }
           }
         })
       ]).scheduleCreate();
 
       schedulePub(args: [command],
           error:
             """
-            Some packages are not compatible with your SDK version 0.1.2+3:
+            Some packages that were installed are not compatible with your SDK version 0.1.2+3 and may not work:
             - 'bar' requires <0.1.1
 
             You may be able to resolve this by upgrading to the latest Dart SDK
             or adding a version constraint to use an older version of a package.
             """);
     });
 
     integration("handles a circular dependency on the root package", () {
       // Using an SDK source, but this should be true of all sources.
       dir(sdkPath, [
@@ skipping 13 matching lines @@
           "dependencies": {
             "foo": { "sdk": "foo" }
           },
           "environment": {"sdk": ">2.0.0"}
         })
       ]).scheduleCreate();
 
       schedulePub(args: [command],
           error:
             """
-            Some packages are not compatible with your SDK version 0.1.2+3:
+            Some packages that were installed are not compatible with your SDK version 0.1.2+3 and may not work:
             - 'myapp' requires >2.0.0
             - 'foo' requires >3.0.0
 
             You may be able to resolve this by upgrading to the latest Dart SDK
             or adding a version constraint to use an older version of a package.
             """);
     });
   }
 }