Fix hints reported by analyzer.

pkg/compiler/lib/src/resolution/members.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.
 
 library dart2js.resolution.members;
 
 import '../common.dart';
 import '../common/names.dart' show Selectors;
 import '../common/resolution.dart' show Resolution;
 import '../compile_time_constants.dart';
@@ skipping 2815 matching lines @@
     } else {
       MemberElement member = element;
       // TODO(johnniwinther): Needed to provoke a parsing and with it discovery
       // of parse errors to make [element] erroneous. Fix this!
       member.computeType(resolution);
       if (member.isMalformed) {
         // [member] has parse errors.
         semantics = new StaticAccess.unresolved(member);
       } else if (member.isFunction) {
         // `a = b`, `a++` or `a += b` where `a` is a function.
-        ErroneousElement error = reportAndCreateErroneousElement(
+        reportAndCreateErroneousElement(
             node.selector, name.text, MessageKind.ASSIGNING_METHOD, const {});
         registry.registerFeature(Feature.THROW_NO_SUCH_METHOD);
         if (node.isComplex) {
           // `a++` or `a += b` where `a` is a function.
           registry.registerStaticUse(new StaticUse.staticTearOff(element));
         }
         semantics = member.isTopLevel
             ? new StaticAccess.topLevelMethod(member)
             : new StaticAccess.staticMethod(member);
       } else {
         // `a = b`, `a++` or `a += b` where `a` is a field.
         assert(invariant(node, member.isField,
             message: "Unexpected element: $member."));
         if (node.isComplex) {
           // `a++` or `a += b` where `a` is a field.
           registry.registerStaticUse(new StaticUse.staticGet(member));
         }
         if (member.isFinal || member.isConst) {
-          ErroneousElement error = reportAndCreateErroneousElement(
+          reportAndCreateErroneousElement(
               node.selector,
               name.text,
               MessageKind.UNDEFINED_STATIC_SETTER_BUT_GETTER,
               {'name': name});
           registry.registerFeature(Feature.THROW_NO_SUCH_METHOD);
           semantics = member.isTopLevel
               ? new StaticAccess.finalTopLevelField(member)
               : new StaticAccess.finalStaticField(member);
         } else {
           registry.registerStaticUse(new StaticUse.staticSet(member));
@@ skipping 1897 matching lines @@
     }
     return const NoneResult();
   }
 }
 
 /// Looks up [name] in [scope] and unwraps the result.
 Element lookupInScope(
     DiagnosticReporter reporter, Node node, Scope scope, String name) {
   return Elements.unwrap(scope.lookup(name), reporter, node);
 }