Refactor SourceFile, SourceFileProvider and SourceLocation.

pkg/compiler/lib/src/dart2js.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 dart2js.cmdline;
 
 import 'dart:async'
     show Future, EventSink;
 import 'dart:convert' show UTF8, LineSplitter;
 import 'dart:io'
@@ skipping 151 matching lines @@
         argument == '--output-type=dart-multi') {
       outputLanguage = OUTPUT_LANGUAGE_DART;
       if (!explicitOut) {
         out = currentDirectory.resolve('out.dart');
         sourceMapOut = currentDirectory.resolve('out.dart.map');
       }
     }
     passThrough(argument);
   }
 
-  String getDepsOutput(Map<String, SourceFile> sourceFiles) {
-    var filenames = new List.from(sourceFiles.keys);
+  String getDepsOutput(Map<Uri, SourceFile> sourceFiles) {
+    var filenames = new List.from(sourceFiles.keys.map((uri) => '$uri'));

[floitsch, 2015/02/13 13:46:03]

since you don't use the generic argument from List.from, just do:
sourceFiles.keys.map((uri) => '$uri').toList().

[Johnni Winther, 2015/02/13 13:55:49]

Done.

     filenames.sort();
     return filenames.join("\n");
   }
 
   setStrip(String argument) {
     optionsImplyCompilation.add(argument);
     stripArgumentSet = true;
     passThrough(argument);
   }
 
@@ skipping 533 matching lines @@
       } else if (exitCode == 253) {
         print(">>> TEST CRASH");
       } else {
         print(">>> TEST FAIL");
       }
       stderr.writeln(">>> EOF STDERR");
       subscription.resume();
     });
   });
 }