Improve detection of compile-time errors.

tools/patch_sdk.dart

 #!/usr/bin/env 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 merge the SDK libraries and our patch files.
 /// This is currently designed as an offline tool, but we could automate it.
 
 import 'dart:io';
 import 'dart:async';
 import 'dart:math' as math;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:path/path.dart' as path;
 import 'package:front_end/src/fasta/compile_platform.dart' as compile_platform;
 
-import 'package:front_end/src/fasta/outline.dart' show CompileTask;
+import 'package:front_end/src/fasta/fasta.dart' show CompileTask;
 
 import 'package:front_end/src/fasta/compiler_command_line.dart'
     show CompilerCommandLine;
 
 import 'package:front_end/src/fasta/compiler_context.dart' show CompilerContext;
 
 import 'package:front_end/src/fasta/ticker.dart' show Ticker;
 
 /// Set of input files that were read by this script to generate patched SDK.
 /// We will dump it out into the depfile for ninja to use.
@@ skipping 577 matching lines @@
     if (diff != 0) return diff;
     return end - other.end;
   }
 }
 
 List<SdkLibrary> _getSdkLibraries(String contents) {
   var libraryBuilder = new SdkLibrariesReader_LibraryBuilder(true);
   parseCompilationUnit(contents).accept(libraryBuilder);
   return libraryBuilder.librariesMap.sdkLibraries;
 }