Fix scheme's toLowerCase detection.

sdk/lib/core/uri.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.
 
 part of dart.core;
 
 /**
  * A parsed URI, such as a URL.
  *
  * **See also:**
@@ skipping 1084 matching lines @@
     return buffer.toString();
   }
 
   /**
    * Validates scheme characters and does case-normalization.
    *
    * Schemes are converted to lower case. They cannot contain escapes.
    */
   static String _makeScheme(String scheme, int end) {
     if (end == 0) return "";
-    int char = scheme.codeUnitAt(0);
-    if (!_isAlphabeticCharacter(char)) {
+    final int firstCodeUnit = scheme.codeUnitAt(0);
+    if (!_isAlphabeticCharacter(firstCodeUnit)) {
       _fail(scheme, 0, "Scheme not starting with alphabetic character");
     }
-    bool allLowercase = char >= _LOWER_CASE_A;
+    bool allLowercase = firstCodeUnit >= _LOWER_CASE_A;
     for (int i = 0; i < end; i++) {
-      int codeUnit = scheme.codeUnitAt(i);
+      final int codeUnit = scheme.codeUnitAt(i);
       if (!_isSchemeCharacter(codeUnit)) {
         _fail(scheme, i, "Illegal scheme character");
       }
-      if (_LOWER_CASE_A <= char && _LOWER_CASE_Z >= char) {
+      if (codeUnit < _LOWER_CASE_A || codeUnit > _LOWER_CASE_Z) {
         allLowercase = false;
       }
     }
     scheme = scheme.substring(0, end);
     if (!allLowercase) scheme = scheme.toLowerCase();
     return scheme;
   }
 
   static String _makeUserInfo(String userInfo, int start, int end) {
     if (userInfo == null) return "";
@@ skipping 1242 matching lines @@
       0xafff,   // 0x30 - 0x3f  1111111111110101
                 //              @ABCDEFGHIJKLMNO
       0xffff,   // 0x40 - 0x4f  1111111111111111
                 //              PQRSTUVWXYZ    _
       0x87ff,   // 0x50 - 0x5f  1111111111100001
                 //               abcdefghijklmno
       0xfffe,   // 0x60 - 0x6f  0111111111111111
                 //              pqrstuvwxyz   ~
       0x47ff];  // 0x70 - 0x7f  1111111111100010
 }