Fix static warnings spotted by dartc.

sdk/lib/_internal/compiler/implementation/types/simple_types_inferrer.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 simple_types_inferrer;
 
 import 'dart:collection' show Queue, LinkedHashSet;
 
 import '../closure.dart' show ClosureClassMap, ClosureScope;
 import '../dart_types.dart'
@@ skipping 753 matching lines @@
 
 
   /**
    * Returns the type of [element]. Returns [:dynamic:] if
    * [element] has not been analyzed yet.
    */
   TypeMask typeOfElement(Element element) {
     element = element.implementation;
     if (isNativeElement(element) && element.isField()) {
       var type = typeOf.putIfAbsent(element, () {
-        InterfaceType type = element.computeType(compiler).asRaw();
-        return type.isDynamic ? dynamicType : new TypeMask.subtype(type);
+        InterfaceType rawType = element.computeType(compiler).asRaw();
+        return rawType.isDynamic ? dynamicType : new TypeMask.subtype(rawType);
       });
       assert(type != null);
       return type;
     }
     TypeMask type = typeOf[element];
     if (type == null) {
       if ((compiler.trustTypeAnnotations
            && (element.isField()
                || element.isParameter()
                || element.isVariable()))
@@ skipping 1831 matching lines @@
         } else {
           result.merge(locals, discardIfAborts: false);
         }
       }
       locals = result;
     }
     clearBreaksAndContinues(elements[node]);
     return inferrer.dynamicType;
   }
 }