Mirrors overhaul.

dart/sdk/lib/_internal/pub/lib/src/utils.dart

 // Copyright (c) 2012, 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.
 
 /// Generic utility functions. Stuff that should possibly be in core.
 library pub.utils;
 
 import 'dart:async';
 import "dart:collection";
 import "dart:convert";
@@ skipping 554 matching lines @@
     for (var pair in resolvedPairs) {
       map[pair.first] = pair.last;
     }
     return map;
   });
 }
 
 /// Returns the path to the library named [libraryName]. The library name must
 /// be globally unique, or the wrong library path may be returned.
 String libraryPath(String libraryName) {
-  var libraries = currentMirrorSystem().findLibrary(new Symbol(libraryName));
-  return path.fromUri(libraries.single.uri);
+  var lib = currentMirrorSystem().findLibrary(new Symbol(libraryName));
+  return path.fromUri(lib.uri);
 }
 
 /// Gets a "special" string (ANSI escape or Unicode). On Windows, returns
 /// something else since those aren't supported.
 String getSpecial(String color, [String onWindows = '']) {
   // No ANSI escapes on windows or when running tests.
   if (runningAsTest || Platform.operatingSystem == 'windows') return onWindows;
   return color;
 }
 
@@ skipping 163 matching lines @@
     error is AnalyzerErrorGroup ||
     error is IsolateSpawnException ||
     error is FileSystemException ||
     error is HttpException ||
     error is HttpException ||
     error is OSError ||
     error is ProcessException ||
     error is SocketException ||
     error is WebSocketException;
 }