Allow changing a file from a part to a library.

lib/devc.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.
 
 /// Command line tool to run the checker on a Dart program.
 library dev_compiler.devc;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
@@ skipping 79 matching lines @@
     return new Compiler._(options, resolver, reporter, rules, checker, graph,
         entryNode, generators);
   }
 
   Compiler._(this._options, this._resolver, this._reporter, this._rules,
       this._checker, this._graph, this._entryNode, this._generators);
 
   bool _buildSource(SourceNode node) {
     if (node is HtmlSourceNode) {
       _buildHtmlFile(node);
-    } else if (node is LibrarySourceNode) {
+    } else if (node is DartSourceNode) {
       _buildDartLibrary(node);
     } else {
       assert(false); // should not get a build request on PartSourceNode
     }
 
     // TODO(sigmund): don't always return true. Use summarization to better
     // determine when rebuilding is needed.
     return true;
   }
 
@@ skipping 16 matching lines @@
         path.dirname(path.dirname(Platform.script.path)), 'lib/runtime/');
     var runtimeOutput = path.join(_options.outputDir, 'dev_compiler/runtime/');
     new Directory(runtimeOutput).createSync(recursive: true);
     new File(path.join(runtimeDir, 'harmony_feature_check.js'))
         .copy(path.join(runtimeOutput, 'harmony_feature_check.js'));
     new File(path.join(runtimeDir, 'dart_runtime.js'))
         .copy(path.join(runtimeOutput, 'dart_runtime.js'));
     _devCompilerRuntimeCopied = true;
   }
 
-  bool _isEntry(LibrarySourceNode node) {
-    if (_entryNode is LibrarySourceNode) return _entryNode == node;
+  bool _isEntry(DartSourceNode node) {
+    if (_entryNode is DartSourceNode) return _entryNode == node;
     return (_entryNode as HtmlSourceNode).scripts.contains(node);
   }
 
-  void _buildDartLibrary(LibrarySourceNode node) {
+  void _buildDartLibrary(DartSourceNode node) {
     var source = node.source;
     // TODO(sigmund): find out from analyzer team if there is a better way
     _resolver.context.applyChanges(new ChangeSet()..changedSource(source));
     var entryUnit = _resolver.context.resolveCompilationUnit2(source, source);
     var lib = entryUnit.element.enclosingElement;
     if (!_options.checkSdk && lib.isInSdk) return;
     var current = node.info;
     if (current != null) {
       assert(current.library == lib);
     } else {
@@ skipping 110 matching lines @@
   }
 
   rebuildIfNeeded(shelf.Request request) {
     var filepath = request.url.path;
     if (filepath == '/$_entryPath' || filepath == '/') compiler._runAgain();
   }
 }
 
 final _log = new Logger('dev_compiler');
 final _earlyErrorResult = new CheckerResults(const [], null, true);