implement generic method runtime behavior, fixes #301

lib/src/compiler/compiler.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:collection' show HashSet;
 import 'package:args/args.dart' show ArgParser, ArgResults;
 import 'package:analyzer/analyzer.dart'
     show
         AnalysisError,
         CompilationUnit,
@@ skipping 49 matching lines @@
 
     // Validate that all parts were explicitly passed in.
     // If not, it's an error.
     var explicitParts = new HashSet<Source>();
     var usedParts = new HashSet<Source>();
     for (var sourcePath in unit.sources) {
       var sourceUri = Uri.parse(sourcePath);
       if (sourceUri.scheme == '') {
         sourceUri = path.toUri(path.absolute(sourcePath));
       }
-      Source source = context.sourceFactory.forUri(sourceUri.toString());
+      Source source = context.sourceFactory.forUri2(sourceUri);
       if (source == null) {
         throw new AnalysisException('could not create a source for $sourcePath.'
             ' The file name is in the wrong format or was not found.');
       }
 
       // Ignore parts. They need to be handled in the context of their library.
       if (context.computeKindOf(source) == SourceKind.PART) {
         explicitParts.add(source);
         continue;
       }
@@ skipping 210 matching lines @@
   }
 }
 
 /// (Public for tests) the error code used when a part is missing.
 final missingPartErrorCode = const CompileTimeErrorCode(
     'MISSING_PART', 'The part was not supplied as an input to the compiler.');
 
 /// (Public for tests) the error code used when a part is unused.
 final unusedPartWarningCode = const StaticWarningCode(
     'UNUSED_PART', 'The part was not used by any libraries being compiled.');