Fix type warnings and a few other warnings, and probably even an error.

lib/compiler/implementation/scanner/parser.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.
 
 /**
  * An event generating parser of Dart programs. This parser expects
  * all tokens in a linked list.
  */
 class Parser {
   final Listener listener;
@@ skipping 919 matching lines @@
       token = parseSend(token);
       listener.handleBinaryExpression(cascadeOperator);
     } else {
       return listener.unexpected(token);
     }
     Token mark;
     do {
       mark = token;
       if (optional('.', token)) {
         Token period = token;
-        token = parseSend(period.token);
+        token = parseSend(token);
         listener.handleBinaryExpression(period);
       }
       token = parseArgumentOrIndexStar(token);
     } while (mark !== token);
 
     if (token.info.precedence === ASSIGNMENT_PRECEDENCE) {
       Token assignment = token;
-      token = parsePrecedenceExpression(token.token, CASCADE_PRECEDENCE + 1);
+      token = parsePrecedenceExpression(token, CASCADE_PRECEDENCE + 1);
       listener.handleAssignmentExpression(assignment);
     }
     listener.endCascade();
     return token;
   }
 
   Token parseUnaryExpression(Token token) {
     String value = token.stringValue;
     // Prefix:
     if (value === '+') {
@@ skipping 591 matching lines @@
     Token label = null;
     // First an optional label.
     if (isIdentifier(token)) {
       label = token;
       token = parseIdentifier(token);
       token = expect(':', token);
     }
     // Then one or more case expressions, the last of which may be
     // 'default' instead.
     int expressionCount = 0;
-    String value = token.stringValue;
-    do {
-      if (value === 'default') {
-        defaultKeyword = token;
-        token = expect(':', token.next);
-        break;
-      }
-      token = expect('case', token);
-      token = parseExpression(token);
-      token = expect(':', token);
-      expressionCount++;
-      value = token.stringValue;
-    } while (value === 'case' || value === 'default');
+    {
+      String value = token.stringValue;
+      do {
+        if (value === 'default') {
+          defaultKeyword = token;
+          token = expect(':', token.next);
+          break;
+        }
+        token = expect('case', token);
+        token = parseExpression(token);
+        token = expect(':', token);
+        expressionCount++;
+        value = token.stringValue;
+      } while (value === 'case' || value === 'default');
+    }
     // Finally zero or more statements.
     int statementCount = 0;
     while (token.kind !== EOF_TOKEN) {
       String value;
       if (isIdentifier(token) && optional(':', token.next)) {
         // Skip label.
         value = token.next.next.stringValue;
       } else {
         value = token.stringValue;
       }
@@ skipping 33 matching lines @@
     }
     listener.handleContinueStatement(hasTarget, continueKeyword, token);
     return expectSemicolon(token);
   }
 
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);
   }
 }