Fix checked mode break in server mode

lib/src/server/server.dart

 // Copyright (c) 2015, 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.
 
 /// Development server that compiles Dart to JS on the fly.
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
@@ skipping 35 matching lines @@
       {AnalysisErrorListener reporter}) {
     var srcOpts = options.sourceOptions;
     var inputFiles = options.inputs;
     var inputUris = inputFiles.map((String inputFile) =>
         inputFile.startsWith('dart:') || inputFile.startsWith('package:')
             ? Uri.parse(inputFile)
             : new Uri.file(path.absolute(srcOpts.useImplicitHtml
                 ? SourceResolverOptions.implicitHtmlFile
                 : inputFile)));
     var graph = new SourceGraph(context, reporter, options);
-    var entryNodes = inputUris.map((inputUri) => graph.nodeFromUri(inputUri));
+    var entryNodes =
+        inputUris.map((inputUri) => graph.nodeFromUri(inputUri)).toList();
 
     return new ServerCompiler._(context, options, reporter, graph, entryNodes);
   }
 
   ServerCompiler._(
       AnalysisContext context,
       CompilerOptions options,
       AnalysisErrorListener reporter,
       SourceGraph graph,
       List<SourceNode> entryNodes)
@@ skipping 264 matching lines @@
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     var src = resolver.resolveAbsolute(uri, actualUri);
     return src.exists() ? src : null;
   }
 
   Uri restoreAbsolute(Source source) => resolver.restoreAbsolute(source);
 }
 
 final _log = new Logger('dev_compiler.src.server');
 final _earlyErrorResult = new CheckerResults(const [], true);