path: Fix some analyzer hints.

lib/src/context.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 path.context;
 
 import 'internal_style.dart';
 import 'style.dart';
 import 'parsed_path.dart';
 import 'path_exception.dart';
@@ skipping 500 matching lines @@
   ///     context.prettyUri('file:///root/path'); // -> 'file:///root/path'
   String prettyUri(uri) {
     if (uri is String) uri = Uri.parse(uri);
     if (uri.scheme == 'file' && style == Style.url) return uri.toString();
     if (uri.scheme != 'file' && uri.scheme != '' && style != Style.url) {
       return uri.toString();
     }
 
     var path = normalize(fromUri(uri));
     var rel = relative(path);
-    var components = split(rel);
 
     // Only return a relative path if it's actually shorter than the absolute
     // path. This avoids ugly things like long "../" chains to get to the root
     // and then go back down.
     return split(rel).length > split(path).length ? path : rel;
   }
 
   ParsedPath _parse(String path) => new ParsedPath.parse(path, style);
 }
 
@@ skipping 12 matching lines @@
     // Show the arguments.
     var message = new StringBuffer();
     message.write("$method(");
     message.write(args.take(numArgs)
         .map((arg) => arg == null ? "null" : '"$arg"')
         .join(", "));
     message.write("): part ${i - 1} was null, but part $i was not.");
     throw new ArgumentError(message.toString());
   }
 }