Remove deprecated string features.

tests/language/char_escape_test.dart

 // Copyright (c) 2011, 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.
 // Dart test for reading escape sequences in string literals
 
 class CharEscapeTest {
   static testMain() {
     var x00 = "\x00";
     var u0000 = "\u0000";
     var v0 = "\u{0}";
     var v00 = "\u{00}";
     var v000 = "\u{000}";
     var v0000 = "\u{0000}";
     var v00000 = "\u{00000}";
     var v000000 = "\u{000000}";
     Expect.equals(1, x00.length);
     Expect.equals(1, u0000.length);
     Expect.equals(1, v0.length);
     Expect.equals(1, v00.length);
     Expect.equals(1, v000.length);
     Expect.equals(1, v0000.length);
     Expect.equals(1, v00000.length);
     Expect.equals(1, v000000.length);
-    Expect.equals(0, x00.charCodeAt(0));
-    Expect.equals(0, u0000.charCodeAt(0));
-    Expect.equals(0, v0.charCodeAt(0));
-    Expect.equals(0, v00.charCodeAt(0));
-    Expect.equals(0, v000.charCodeAt(0));
-    Expect.equals(0, v0000.charCodeAt(0));
-    Expect.equals(0, v00000.charCodeAt(0));
-    Expect.equals(0, v000000.charCodeAt(0));
+    Expect.equals(0, x00.codeUnitAt(0));
+    Expect.equals(0, u0000.codeUnitAt(0));
+    Expect.equals(0, v0.codeUnitAt(0));
+    Expect.equals(0, v00.codeUnitAt(0));
+    Expect.equals(0, v000.codeUnitAt(0));
+    Expect.equals(0, v0000.codeUnitAt(0));
+    Expect.equals(0, v00000.codeUnitAt(0));
+    Expect.equals(0, v000000.codeUnitAt(0));
     Expect.equals("\x00", new String.fromCharCodes([0]));
     Expect.equals("\u0000", new String.fromCharCodes([0]));
     Expect.equals("\u{0}", new String.fromCharCodes([0]));
     Expect.equals("\u{00}", new String.fromCharCodes([0]));
     Expect.equals("\u{000}", new String.fromCharCodes([0]));
     Expect.equals("\u{0000}", new String.fromCharCodes([0]));
     Expect.equals("\u{00000}", new String.fromCharCodes([0]));
     Expect.equals("\u{000000}", new String.fromCharCodes([0]));
 
     var x01 = "\x01";
     var u0001 = "\u0001";
     var v1 = "\u{1}";
     var v01 = "\u{01}";
     var v001 = "\u{001}";
     var v0001 = "\u{0001}";
     var v00001 = "\u{00001}";
     var v000001 = "\u{000001}";
     Expect.equals(1, x01.length);
     Expect.equals(1, u0001.length);
     Expect.equals(1, v1.length);
     Expect.equals(1, v01.length);
     Expect.equals(1, v001.length);
     Expect.equals(1, v0001.length);
     Expect.equals(1, v00001.length);
     Expect.equals(1, v000001.length);
-    Expect.equals(1, x01.charCodeAt(0));
-    Expect.equals(1, u0001.charCodeAt(0));
-    Expect.equals(1, v1.charCodeAt(0));
-    Expect.equals(1, v01.charCodeAt(0));
-    Expect.equals(1, v001.charCodeAt(0));
-    Expect.equals(1, v0001.charCodeAt(0));
-    Expect.equals(1, v00001.charCodeAt(0));
-    Expect.equals(1, v000001.charCodeAt(0));
+    Expect.equals(1, x01.codeUnitAt(0));
+    Expect.equals(1, u0001.codeUnitAt(0));
+    Expect.equals(1, v1.codeUnitAt(0));
+    Expect.equals(1, v01.codeUnitAt(0));
+    Expect.equals(1, v001.codeUnitAt(0));
+    Expect.equals(1, v0001.codeUnitAt(0));
+    Expect.equals(1, v00001.codeUnitAt(0));
+    Expect.equals(1, v000001.codeUnitAt(0));
     Expect.equals("\x01", new String.fromCharCodes([1]));
     Expect.equals("\u0001", new String.fromCharCodes([1]));
     Expect.equals("\u{1}", new String.fromCharCodes([1]));
     Expect.equals("\u{01}", new String.fromCharCodes([1]));
     Expect.equals("\u{001}", new String.fromCharCodes([1]));
     Expect.equals("\u{0001}", new String.fromCharCodes([1]));
     Expect.equals("\u{00001}", new String.fromCharCodes([1]));
     Expect.equals("\u{000001}", new String.fromCharCodes([1]));
 
     var x55 = "\x55";
     var u0055 = "\u0055";
     var v55 = "\u{55}";
     var v055 = "\u{055}";
     var v0055 = "\u{0055}";
     var v00055 = "\u{00055}";
     var v000055 = "\u{000055}";
     Expect.equals(1, x55.length);
     Expect.equals(1, u0055.length);
     Expect.equals(1, v55.length);
     Expect.equals(1, v055.length);
     Expect.equals(1, v0055.length);
     Expect.equals(1, v00055.length);
     Expect.equals(1, v000055.length);
-    Expect.equals(0x55, x55.charCodeAt(0));
-    Expect.equals(0x55, u0055.charCodeAt(0));
-    Expect.equals(0x55, v55.charCodeAt(0));
-    Expect.equals(0x55, v055.charCodeAt(0));
-    Expect.equals(0x55, v0055.charCodeAt(0));
-    Expect.equals(0x55, v00055.charCodeAt(0));
-    Expect.equals(0x55, v000055.charCodeAt(0));
+    Expect.equals(0x55, x55.codeUnitAt(0));
+    Expect.equals(0x55, u0055.codeUnitAt(0));
+    Expect.equals(0x55, v55.codeUnitAt(0));
+    Expect.equals(0x55, v055.codeUnitAt(0));
+    Expect.equals(0x55, v0055.codeUnitAt(0));
+    Expect.equals(0x55, v00055.codeUnitAt(0));
+    Expect.equals(0x55, v000055.codeUnitAt(0));
     Expect.equals("\x55", new String.fromCharCodes([0x55]));
     Expect.equals("\u0055", new String.fromCharCodes([0x55]));
     Expect.equals("\u{55}", new String.fromCharCodes([0x55]));
     Expect.equals("\u{055}", new String.fromCharCodes([0x55]));
     Expect.equals("\u{0055}", new String.fromCharCodes([0x55]));
     Expect.equals("\u{00055}", new String.fromCharCodes([0x55]));
     Expect.equals("\u{000055}", new String.fromCharCodes([0x55]));
 
     var x7F = "\x7F";
     var u007F = "\u007F";
     var v7F = "\u{7F}";
     var v07F = "\u{07F}";
     var v007F = "\u{007F}";
     var v0007F = "\u{0007F}";
     var v00007F = "\u{00007F}";
     Expect.equals(1, x7F.length);
     Expect.equals(1, u007F.length);
     Expect.equals(1, v7F.length);
     Expect.equals(1, v07F.length);
     Expect.equals(1, v007F.length);
     Expect.equals(1, v0007F.length);
     Expect.equals(1, v00007F.length);
-    Expect.equals(0x7F, x7F.charCodeAt(0));
-    Expect.equals(0x7F, u007F.charCodeAt(0));
-    Expect.equals(0x7F, v7F.charCodeAt(0));
-    Expect.equals(0x7F, v07F.charCodeAt(0));
-    Expect.equals(0x7F, v007F.charCodeAt(0));
-    Expect.equals(0x7F, v0007F.charCodeAt(0));
-    Expect.equals(0x7F, v00007F.charCodeAt(0));
+    Expect.equals(0x7F, x7F.codeUnitAt(0));
+    Expect.equals(0x7F, u007F.codeUnitAt(0));
+    Expect.equals(0x7F, v7F.codeUnitAt(0));
+    Expect.equals(0x7F, v07F.codeUnitAt(0));
+    Expect.equals(0x7F, v007F.codeUnitAt(0));
+    Expect.equals(0x7F, v0007F.codeUnitAt(0));
+    Expect.equals(0x7F, v00007F.codeUnitAt(0));
     Expect.equals("\x7F", new String.fromCharCodes([0x7F]));
     Expect.equals("\u007F", new String.fromCharCodes([0x7F]));
     Expect.equals("\u{7F}", new String.fromCharCodes([0x7F]));
     Expect.equals("\u{07F}", new String.fromCharCodes([0x7F]));
     Expect.equals("\u{007F}", new String.fromCharCodes([0x7F]));
     Expect.equals("\u{0007F}", new String.fromCharCodes([0x7F]));
     Expect.equals("\u{00007F}", new String.fromCharCodes([0x7F]));
 
     var x80 = "\x80";
     var u0080 = "\u0080";
     var v80 = "\u{80}";
     var v080 = "\u{080}";
     var v0080 = "\u{0080}";
     var v00080 = "\u{00080}";
     var v000080 = "\u{000080}";
     Expect.equals(1, x80.length);
     Expect.equals(1, u0080.length);
     Expect.equals(1, v80.length);
     Expect.equals(1, v080.length);
     Expect.equals(1, v0080.length);
     Expect.equals(1, v00080.length);
     Expect.equals(1, v000080.length);
-    Expect.equals(0x80, x80.charCodeAt(0));
-    Expect.equals(0x80, u0080.charCodeAt(0));
-    Expect.equals(0x80, v80.charCodeAt(0));
-    Expect.equals(0x80, v080.charCodeAt(0));
-    Expect.equals(0x80, v0080.charCodeAt(0));
-    Expect.equals(0x80, v00080.charCodeAt(0));
-    Expect.equals(0x80, v000080.charCodeAt(0));
+    Expect.equals(0x80, x80.codeUnitAt(0));
+    Expect.equals(0x80, u0080.codeUnitAt(0));
+    Expect.equals(0x80, v80.codeUnitAt(0));
+    Expect.equals(0x80, v080.codeUnitAt(0));
+    Expect.equals(0x80, v0080.codeUnitAt(0));
+    Expect.equals(0x80, v00080.codeUnitAt(0));
+    Expect.equals(0x80, v000080.codeUnitAt(0));
     Expect.equals("\x80", new String.fromCharCodes([0x80]));
     Expect.equals("\u0080", new String.fromCharCodes([0x80]));
     Expect.equals("\u{80}", new String.fromCharCodes([0x80]));
     Expect.equals("\u{080}", new String.fromCharCodes([0x80]));
     Expect.equals("\u{0080}", new String.fromCharCodes([0x80]));
     Expect.equals("\u{00080}", new String.fromCharCodes([0x80]));
     Expect.equals("\u{000080}", new String.fromCharCodes([0x80]));
 
     var xAA = "\xAA";
     var u00AA = "\u00AA";
     var vAA = "\u{AA}";
     var v0AA = "\u{0AA}";
     var v00AA = "\u{00AA}";
     var v000AA = "\u{000AA}";
     var v0000AA = "\u{0000AA}";
     Expect.equals(1, xAA.length);
     Expect.equals(1, u00AA.length);
     Expect.equals(1, vAA.length);
     Expect.equals(1, v0AA.length);
     Expect.equals(1, v00AA.length);
     Expect.equals(1, v000AA.length);
     Expect.equals(1, v0000AA.length);
-    Expect.equals(0xAA, xAA.charCodeAt(0));
-    Expect.equals(0xAA, u00AA.charCodeAt(0));
-    Expect.equals(0xAA, vAA.charCodeAt(0));
-    Expect.equals(0xAA, v0AA.charCodeAt(0));
-    Expect.equals(0xAA, v00AA.charCodeAt(0));
-    Expect.equals(0xAA, v000AA.charCodeAt(0));
-    Expect.equals(0xAA, v0000AA.charCodeAt(0));
+    Expect.equals(0xAA, xAA.codeUnitAt(0));
+    Expect.equals(0xAA, u00AA.codeUnitAt(0));
+    Expect.equals(0xAA, vAA.codeUnitAt(0));
+    Expect.equals(0xAA, v0AA.codeUnitAt(0));
+    Expect.equals(0xAA, v00AA.codeUnitAt(0));
+    Expect.equals(0xAA, v000AA.codeUnitAt(0));
+    Expect.equals(0xAA, v0000AA.codeUnitAt(0));
     Expect.equals("\xAA", new String.fromCharCodes([0xAA]));
     Expect.equals("\u00AA", new String.fromCharCodes([0xAA]));
     Expect.equals("\u{AA}", new String.fromCharCodes([0xAA]));
     Expect.equals("\u{0AA}", new String.fromCharCodes([0xAA]));
     Expect.equals("\u{00AA}", new String.fromCharCodes([0xAA]));
     Expect.equals("\u{000AA}", new String.fromCharCodes([0xAA]));
     Expect.equals("\u{0000AA}", new String.fromCharCodes([0xAA]));
 
     var xFE = "\xFE";
     var u00FE = "\u00FE";
     var vFE = "\u{FE}";
     var v0FE = "\u{0FE}";
     var v00FE = "\u{00FE}";
     var v000FE = "\u{000FE}";
     var v0000FE = "\u{0000FE}";
     Expect.equals(1, xFE.length);
     Expect.equals(1, u00FE.length);
     Expect.equals(1, vFE.length);
     Expect.equals(1, v0FE.length);
     Expect.equals(1, v00FE.length);
     Expect.equals(1, v000FE.length);
     Expect.equals(1, v0000FE.length);
-    Expect.equals(0xFE, xFE.charCodeAt(0));
-    Expect.equals(0xFE, u00FE.charCodeAt(0));
-    Expect.equals(0xFE, vFE.charCodeAt(0));
-    Expect.equals(0xFE, v0FE.charCodeAt(0));
-    Expect.equals(0xFE, v00FE.charCodeAt(0));
-    Expect.equals(0xFE, v000FE.charCodeAt(0));
-    Expect.equals(0xFE, v0000FE.charCodeAt(0));
+    Expect.equals(0xFE, xFE.codeUnitAt(0));
+    Expect.equals(0xFE, u00FE.codeUnitAt(0));
+    Expect.equals(0xFE, vFE.codeUnitAt(0));
+    Expect.equals(0xFE, v0FE.codeUnitAt(0));
+    Expect.equals(0xFE, v00FE.codeUnitAt(0));
+    Expect.equals(0xFE, v000FE.codeUnitAt(0));
+    Expect.equals(0xFE, v0000FE.codeUnitAt(0));
     Expect.equals("\xFE", new String.fromCharCodes([0xFE]));
     Expect.equals("\u00FE", new String.fromCharCodes([0xFE]));
     Expect.equals("\u{FE}", new String.fromCharCodes([0xFE]));
     Expect.equals("\u{0FE}", new String.fromCharCodes([0xFE]));
     Expect.equals("\u{00FE}", new String.fromCharCodes([0xFE]));
     Expect.equals("\u{000FE}", new String.fromCharCodes([0xFE]));
     Expect.equals("\u{0000FE}", new String.fromCharCodes([0xFE]));
 
     var xFF = "\xFF";
     var u00FF = "\u00FF";
     var vFF = "\u{FF}";
     var v0FF = "\u{0FF}";
     var v00FF = "\u{00FF}";
     var v000FF = "\u{000FF}";
     var v0000FF = "\u{0000FF}";
     Expect.equals(1, xFF.length);
     Expect.equals(1, u00FF.length);
     Expect.equals(1, vFF.length);
     Expect.equals(1, v0FF.length);
     Expect.equals(1, v00FF.length);
     Expect.equals(1, v000FF.length);
     Expect.equals(1, v0000FF.length);
-    Expect.equals(0xFF, xFF.charCodeAt(0));
-    Expect.equals(0xFF, u00FF.charCodeAt(0));
-    Expect.equals(0xFF, vFF.charCodeAt(0));
-    Expect.equals(0xFF, v0FF.charCodeAt(0));
-    Expect.equals(0xFF, v00FF.charCodeAt(0));
-    Expect.equals(0xFF, v000FF.charCodeAt(0));
-    Expect.equals(0xFF, v0000FF.charCodeAt(0));
+    Expect.equals(0xFF, xFF.codeUnitAt(0));
+    Expect.equals(0xFF, u00FF.codeUnitAt(0));
+    Expect.equals(0xFF, vFF.codeUnitAt(0));
+    Expect.equals(0xFF, v0FF.codeUnitAt(0));
+    Expect.equals(0xFF, v00FF.codeUnitAt(0));
+    Expect.equals(0xFF, v000FF.codeUnitAt(0));
+    Expect.equals(0xFF, v0000FF.codeUnitAt(0));
     Expect.equals("\xFF", new String.fromCharCodes([0xFF]));
     Expect.equals("\u00FF", new String.fromCharCodes([0xFF]));
     Expect.equals("\u{FF}", new String.fromCharCodes([0xFF]));
     Expect.equals("\u{0FF}", new String.fromCharCodes([0xFF]));
     Expect.equals("\u{00FF}", new String.fromCharCodes([0xFF]));
     Expect.equals("\u{000FF}", new String.fromCharCodes([0xFF]));
     Expect.equals("\u{0000FF}", new String.fromCharCodes([0xFF]));
 
     var u1000 = "\u1000";
     var v1000 = "\u{1000}";
     var v01000 = "\u{01000}";
     var v001000 = "\u{001000}";
     Expect.equals(1, u1000.length);
     Expect.equals(1, v1000.length);
     Expect.equals(1, v01000.length);
     Expect.equals(1, v001000.length);
-    Expect.equals(0x1000, u1000.charCodeAt(0));
-    Expect.equals(0x1000, v1000.charCodeAt(0));
-    Expect.equals(0x1000, v01000.charCodeAt(0));
-    Expect.equals(0x1000, v001000.charCodeAt(0));
+    Expect.equals(0x1000, u1000.codeUnitAt(0));
+    Expect.equals(0x1000, v1000.codeUnitAt(0));
+    Expect.equals(0x1000, v01000.codeUnitAt(0));
+    Expect.equals(0x1000, v001000.codeUnitAt(0));
     Expect.equals("\u1000", new String.fromCharCodes([0x1000]));
     Expect.equals("\u{1000}", new String.fromCharCodes([0x1000]));
     Expect.equals("\u{01000}", new String.fromCharCodes([0x1000]));
     Expect.equals("\u{001000}", new String.fromCharCodes([0x1000]));
 
     var u5555 = "\u5555";
     var v5555 = "\u{5555}";
     var v05555 = "\u{05555}";
     var v005555 = "\u{005555}";
     Expect.equals(1, u5555.length);
     Expect.equals(1, v5555.length);
     Expect.equals(1, v05555.length);
     Expect.equals(1, v005555.length);
-    Expect.equals(0x5555, u5555.charCodeAt(0));
-    Expect.equals(0x5555, v5555.charCodeAt(0));
-    Expect.equals(0x5555, v05555.charCodeAt(0));
-    Expect.equals(0x5555, v005555.charCodeAt(0));
+    Expect.equals(0x5555, u5555.codeUnitAt(0));
+    Expect.equals(0x5555, v5555.codeUnitAt(0));
+    Expect.equals(0x5555, v05555.codeUnitAt(0));
+    Expect.equals(0x5555, v005555.codeUnitAt(0));
     Expect.equals("\u5555", new String.fromCharCodes([0x5555]));
     Expect.equals("\u{5555}", new String.fromCharCodes([0x5555]));
     Expect.equals("\u{05555}", new String.fromCharCodes([0x5555]));
     Expect.equals("\u{005555}", new String.fromCharCodes([0x5555]));
 
     var u7FFF = "\u7FFF";
     var v7FFF = "\u{7FFF}";
     var v07FFF = "\u{07FFF}";
     var v007FFF = "\u{007FFF}";
     Expect.equals(1, u7FFF.length);
     Expect.equals(1, v7FFF.length);
     Expect.equals(1, v07FFF.length);
     Expect.equals(1, v007FFF.length);
-    Expect.equals(0x7FFF, u7FFF.charCodeAt(0));
-    Expect.equals(0x7FFF, v7FFF.charCodeAt(0));
-    Expect.equals(0x7FFF, v07FFF.charCodeAt(0));
-    Expect.equals(0x7FFF, v007FFF.charCodeAt(0));
+    Expect.equals(0x7FFF, u7FFF.codeUnitAt(0));
+    Expect.equals(0x7FFF, v7FFF.codeUnitAt(0));
+    Expect.equals(0x7FFF, v07FFF.codeUnitAt(0));
+    Expect.equals(0x7FFF, v007FFF.codeUnitAt(0));
     Expect.equals("\u7FFF", new String.fromCharCodes([0x7FFF]));
     Expect.equals("\u{7FFF}", new String.fromCharCodes([0x7FFF]));
     Expect.equals("\u{07FFF}", new String.fromCharCodes([0x7FFF]));
     Expect.equals("\u{007FFF}", new String.fromCharCodes([0x7FFF]));
 
     var u8000 = "\u8000";
     var v8000 = "\u{8000}";
     var v08000 = "\u{08000}";
     var v008000 = "\u{008000}";
     Expect.equals(1, u8000.length);
     Expect.equals(1, v8000.length);
     Expect.equals(1, v08000.length);
     Expect.equals(1, v008000.length);
-    Expect.equals(0x8000, u8000.charCodeAt(0));
-    Expect.equals(0x8000, v8000.charCodeAt(0));
-    Expect.equals(0x8000, v08000.charCodeAt(0));
-    Expect.equals(0x8000, v008000.charCodeAt(0));
+    Expect.equals(0x8000, u8000.codeUnitAt(0));
+    Expect.equals(0x8000, v8000.codeUnitAt(0));
+    Expect.equals(0x8000, v08000.codeUnitAt(0));
+    Expect.equals(0x8000, v008000.codeUnitAt(0));
     Expect.equals("\u8000", new String.fromCharCodes([0x8000]));
     Expect.equals("\u{8000}", new String.fromCharCodes([0x8000]));
     Expect.equals("\u{08000}", new String.fromCharCodes([0x8000]));
     Expect.equals("\u{008000}", new String.fromCharCodes([0x8000]));
 
     var uAAAA = "\uAAAA";
     var vAAAA = "\u{AAAA}";
     var v0AAAA = "\u{0AAAA}";
     var v00AAAA = "\u{00AAAA}";
     Expect.equals(1, uAAAA.length);
     Expect.equals(1, vAAAA.length);
     Expect.equals(1, v0AAAA.length);
     Expect.equals(1, v00AAAA.length);
-    Expect.equals(0xAAAA, uAAAA.charCodeAt(0));
-    Expect.equals(0xAAAA, vAAAA.charCodeAt(0));
-    Expect.equals(0xAAAA, v0AAAA.charCodeAt(0));
-    Expect.equals(0xAAAA, v00AAAA.charCodeAt(0));
+    Expect.equals(0xAAAA, uAAAA.codeUnitAt(0));
+    Expect.equals(0xAAAA, vAAAA.codeUnitAt(0));
+    Expect.equals(0xAAAA, v0AAAA.codeUnitAt(0));
+    Expect.equals(0xAAAA, v00AAAA.codeUnitAt(0));
     Expect.equals("\uAAAA", new String.fromCharCodes([0xAAAA]));
     Expect.equals("\u{AAAA}", new String.fromCharCodes([0xAAAA]));
     Expect.equals("\u{0AAAA}", new String.fromCharCodes([0xAAAA]));
     Expect.equals("\u{00AAAA}", new String.fromCharCodes([0xAAAA]));
 
     var uFFFE = "\uFFFE";
     var vFFFE = "\u{FFFE}";
     var v0FFFE = "\u{0FFFE}";
     var v00FFFE = "\u{00FFFE}";
     Expect.equals(1, uFFFE.length);
     Expect.equals(1, vFFFE.length);
     Expect.equals(1, v0FFFE.length);
     Expect.equals(1, v00FFFE.length);
-    Expect.equals(0xFFFE, uFFFE.charCodeAt(0));
-    Expect.equals(0xFFFE, vFFFE.charCodeAt(0));
-    Expect.equals(0xFFFE, v0FFFE.charCodeAt(0));
-    Expect.equals(0xFFFE, v00FFFE.charCodeAt(0));
+    Expect.equals(0xFFFE, uFFFE.codeUnitAt(0));
+    Expect.equals(0xFFFE, vFFFE.codeUnitAt(0));
+    Expect.equals(0xFFFE, v0FFFE.codeUnitAt(0));
+    Expect.equals(0xFFFE, v00FFFE.codeUnitAt(0));
     Expect.equals("\uFFFE", new String.fromCharCodes([0xFFFE]));
     Expect.equals("\u{FFFE}", new String.fromCharCodes([0xFFFE]));
     Expect.equals("\u{0FFFE}", new String.fromCharCodes([0xFFFE]));
     Expect.equals("\u{00FFFE}", new String.fromCharCodes([0xFFFE]));
 
     var uFFFF = "\uFFFF";
     var vFFFF = "\u{FFFF}";
     var v0FFFF = "\u{0FFFF}";
     var v00FFFF = "\u{00FFFF}";
     Expect.equals(1, uFFFF.length);
     Expect.equals(1, vFFFF.length);
     Expect.equals(1, v0FFFF.length);
     Expect.equals(1, v00FFFF.length);
-    Expect.equals(0xFFFF, uFFFF.charCodeAt(0));
-    Expect.equals(0xFFFF, vFFFF.charCodeAt(0));
-    Expect.equals(0xFFFF, v0FFFF.charCodeAt(0));
-    Expect.equals(0xFFFF, v00FFFF.charCodeAt(0));
+    Expect.equals(0xFFFF, uFFFF.codeUnitAt(0));
+    Expect.equals(0xFFFF, vFFFF.codeUnitAt(0));
+    Expect.equals(0xFFFF, v0FFFF.codeUnitAt(0));
+    Expect.equals(0xFFFF, v00FFFF.codeUnitAt(0));
     Expect.equals("\uFFFF", new String.fromCharCodes([0xFFFF]));
     Expect.equals("\u{FFFF}", new String.fromCharCodes([0xFFFF]));
     Expect.equals("\u{0FFFF}", new String.fromCharCodes([0xFFFF]));
     Expect.equals("\u{00FFFF}", new String.fromCharCodes([0xFFFF]));
 
     var v10000 = "\u{10000}";
     var v010000 = "\u{010000}";
     Expect.equals(2, v10000.length);
     Expect.equals(2, v010000.length);
     Expect.equals("\u{10000}", new String.fromCharCodes([0x10000]));
@@ skipping 10 matching lines @@
     Expect.equals(2, v105555.length);
     Expect.equals("\u{105555}", new String.fromCharCodes([0x105555]));
 
     var v10FFFF = "\u{10FFFF}";
     Expect.equals(2, v10FFFF.length);
     Expect.equals("\u{10FFFF}", new String.fromCharCodes([0x10FFFF]));
 
     var bs = "\b";
     Expect.isTrue(bs != "b");
     Expect.equals(1, bs.length);
-    Expect.equals(0x08, bs.charCodeAt(0));
+    Expect.equals(0x08, bs.codeUnitAt(0));
     Expect.equals(bs, new String.fromCharCodes([0x08]));
     Expect.equals("\x08", bs);
     Expect.equals("\u0008", bs);
     Expect.equals("\u{8}", bs);
     Expect.equals("\u{08}", bs);
     Expect.equals("\u{008}", bs);
     Expect.equals("\u{0008}", bs);
     Expect.equals("\u{00008}", bs);
     Expect.equals("\u{000008}", bs);
 
     var ht = "\t";
     Expect.isTrue(ht != "t");
     Expect.equals(1, ht.length);
-    Expect.equals(0x09, ht.charCodeAt(0));
+    Expect.equals(0x09, ht.codeUnitAt(0));
     Expect.equals(ht, new String.fromCharCodes([0x09]));
     Expect.equals("\x09", ht);
     Expect.equals("\u0009", ht);
     Expect.equals("\u{9}", ht);
     Expect.equals("\u{09}", ht);
     Expect.equals("\u{009}", ht);
     Expect.equals("\u{0009}", ht);
     Expect.equals("\u{00009}", ht);
     Expect.equals("\u{000009}", ht);
 
     var lf = "\n";
     Expect.isTrue(lf != "n");
     Expect.equals(1, lf.length);
-    Expect.equals(0x0A, lf.charCodeAt(0));
+    Expect.equals(0x0A, lf.codeUnitAt(0));
     Expect.equals(lf, new String.fromCharCodes([0x0A]));
     Expect.equals("\x0A", lf);
     Expect.equals("\u000A", lf);
     Expect.equals("\u{A}", lf);
     Expect.equals("\u{0A}", lf);
     Expect.equals("\u{00A}", lf);
     Expect.equals("\u{000A}", lf);
     Expect.equals("\u{0000A}", lf);
     Expect.equals("\u{00000A}", lf);
 
     var vt = "\v";
     Expect.isTrue(vt != "v");
     Expect.equals(1, vt.length);
-    Expect.equals(0x0B, vt.charCodeAt(0));
+    Expect.equals(0x0B, vt.codeUnitAt(0));
     Expect.equals(vt, new String.fromCharCodes([0x0B]));
     Expect.equals("\x0B", vt);
     Expect.equals("\u000B", vt);
     Expect.equals("\u{B}", vt);
     Expect.equals("\u{0B}", vt);
     Expect.equals("\u{00B}", vt);
     Expect.equals("\u{000B}", vt);
     Expect.equals("\u{0000B}", vt);
     Expect.equals("\u{00000B}", vt);
 
     var ff = "\f";
     Expect.isTrue(ff != "f");
     Expect.equals(1, ff.length);
-    Expect.equals(0x0C, ff.charCodeAt(0));
+    Expect.equals(0x0C, ff.codeUnitAt(0));
     Expect.equals(ff, new String.fromCharCodes([0x0C]));
     Expect.equals("\x0C", ff);
     Expect.equals("\u000C", ff);
     Expect.equals("\u{C}", ff);
     Expect.equals("\u{0C}", ff);
     Expect.equals("\u{00C}", ff);
     Expect.equals("\u{000C}", ff);
     Expect.equals("\u{0000C}", ff);
     Expect.equals("\u{00000C}", ff);
 
     var cr = "\r";
     Expect.isTrue(cr != "r");
     Expect.equals(1, cr.length);
-    Expect.equals(0x0D, cr.charCodeAt(0));
+    Expect.equals(0x0D, cr.codeUnitAt(0));
     Expect.equals(cr, new String.fromCharCodes([0x0D]));
     Expect.equals("\x0D", cr);
     Expect.equals("\u000D", cr);
     Expect.equals("\u{D}", cr);
     Expect.equals("\u{0D}", cr);
     Expect.equals("\u{00D}", cr);
     Expect.equals("\u{000D}", cr);
     Expect.equals("\u{0000D}", cr);
     Expect.equals("\u{00000D}", cr);
 
@@ skipping 49 matching lines @@
     Expect.equals("\W", "W");
     Expect.equals("\X", "X");
     Expect.equals("\Y", "Y");
     Expect.equals("\Z", "Z");
   }
 }
 
 main() {
   CharEscapeTest.testMain();
 }