Issue 15037. Warn users if they have “assets” dir anywhere inside “web” dir (http://dartbug.com/150…

sdk/lib/_internal/pub/lib/src/command/build.dart

 // Copyright (c) 2013, 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.command.build;
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as path;
@@ skipping 34 matching lines @@
   Future onRun() {
     if (!dirExists(source)) {
       throw new ApplicationException('There is no "$source" directory.');
     }
 
     cleanDir(target);
 
     var dart2jsTransformer;
     var builtFiles = 0;
 
-    return entrypoint.ensureLockFileIsUpToDate().then((_) {
-      return entrypoint.loadPackageGraph();
-    }).then((graph) {
+    return entrypoint.loadPackageGraph().then((graph) {
       dart2jsTransformer = new Dart2JSTransformer(graph, mode);
       var builtInTransformers = [
         dart2jsTransformer,
         new DartForwardingTransformer(mode)
       ];
 
       // Since this server will only be hit by the transformer loader and isn't
       // user-facing, just use an IPv4 address to avoid a weird bug on the
       // OS X buildbots.
       // TODO(rnystrom): Allow specifying mode.
@@ skipping 79 matching lines @@
   // TODO(nweiz): do something more principled when issue 6101 is fixed.
   /// Ensures that the [name].js file is copied into [directory] in [target],
   /// under `packages/browser/`.
   void _addBrowserJs(String directory, String name) {
     var jsPath = path.join(
         target, directory, 'packages', 'browser', '$name.js');
     ensureDir(path.dirname(jsPath));
     copyFile(path.join(entrypoint.packagesDir, 'browser', '$name.js'), jsPath);
   }
 }