Handle const loop variable.

pkg/compiler/lib/src/parser/parser.dart

Index: pkg/compiler/lib/src/parser/parser.dart
diff --git a/pkg/compiler/lib/src/parser/parser.dart b/pkg/compiler/lib/src/parser/parser.dart
index 7adddb5f2cff272bf02554d1515d2f9287f52119..3320c43bf20f863d703d674cae497a6e6b08a3e7 100644
--- a/pkg/compiler/lib/src/parser/parser.dart
+++ b/pkg/compiler/lib/src/parser/parser.dart
@@ -660,15 +660,27 @@ class Parser {
 
   /**
    * Returns true if the stringValue of the [token] is either [value1],
+   * [value2], or [value3].
+   */
+  bool isOneOf3(Token token, String value1, String value2, String value3) {
+    String stringValue = token.stringValue;
+    return
+        value1 == stringValue ||
+        value2 == stringValue ||
+        value3 == stringValue;
+  }
+
+  /**
+   * Returns true if the stringValue of the [token] is either [value1],
    * [value2], [value3], or [value4].
    */
   bool isOneOf4(Token token,
                 String value1, String value2, String value3, String value4) {
     String stringValue = token.stringValue;
-    return identical(value1, stringValue) ||
-           identical(value2, stringValue) ||
-           identical(value3, stringValue) ||
-           identical(value4, stringValue);
+    return value1 == stringValue ||
+           value2 == stringValue ||
+           value3 == stringValue ||
+           value4 == stringValue;
   }
 
   bool notEofOrValue(String value, Token token) {
@@ -2427,7 +2439,7 @@ class Parser {
     if (identical(value, ';')) {
       listener.handleNoExpression(token);
       return token;
-    } else if ((identical(value, 'var')) || (identical(value, 'final'))) {
+    } else if (isOneOf3(token, 'var', 'final', 'const')) {
       return parseVariablesDeclarationNoSemicolon(token);
     }
     Token identifier = peekIdentifierAfterType(token);