dart2js cleanup: remove unused imports and variables

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 Feature;
 import '../compiler.dart' show Compiler;
 import '../constants/constructors.dart'
     show RedirectingFactoryConstantConstructor;
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../core_types.dart';
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../elements/modelx.dart'
     show
         ConstructorElementX,
         ErroneousElementX,
         FunctionElementX,
         JumpTargetX,
         LocalFunctionElementX,
         LocalParameterElementX,
-        LocalVariableElementX,
         MethodElementX,
         ParameterElementX,
         VariableElementX,
         VariableList;
 import '../tokens/token.dart' show isUserDefinableOperator;
 import '../tree/tree.dart';
-import '../util/util.dart' show Link;
 import '../universe/call_structure.dart' show CallStructure;
 import '../universe/selector.dart' show Selector;
 import '../universe/use.dart' show DynamicUse, StaticUse, TypeUse;
-
+import '../util/util.dart' show Link;
 import 'access_semantics.dart';
 import 'class_members.dart' show MembersCreator;
-import 'operators.dart';
-import 'send_structure.dart';
-
 import 'constructors.dart'
     show ConstructorResolver, ConstructorResult, ConstructorResultKind;
 import 'label_scope.dart' show StatementScope;
+import 'operators.dart';
 import 'registry.dart' show ResolutionRegistry;
 import 'resolution.dart' show ResolverTask;
 import 'resolution_common.dart' show MappingVisitor;
 import 'resolution_result.dart';
 import 'scope.dart' show BlockScope, MethodScope, Scope;
+import 'send_structure.dart';
 import 'signatures.dart' show SignatureResolver;
 import 'variables.dart' show VariableDefinitionsVisitor;
 
 /// The state of constants in resolutions.
 enum ConstantState {
   /// Expressions are not required to be constants.
   NON_CONSTANT,
 
   /// Expressions are required to be constants.
   ///
@@ skipping 3275 matching lines @@
         }
         return handleUpdate(node, name, semantics);
       }
     }
   }
 
   /// Handle update of an entity defined by [semantics]. For instance `a = b`,
   /// `a++` or `a += b` where [semantics] describe `a`.
   ResolutionResult handleUpdate(
       SendSet node, Name name, AccessSemantics semantics) {
-    SendStructure sendStructure;
     String operatorText = node.assignmentOperator.source;
     Selector getterSelector = new Selector.getter(name);
     Selector setterSelector = new Selector.setter(name);
     if (node.isPrefix || node.isPostfix) {
       // `e++` or `++e`.
       IncDecOperator operator = IncDecOperator.parse(operatorText);
       Selector operatorSelector =
           new Selector.binaryOperator(operator.selectorName);
 
       // TODO(23998): Remove these when selectors are only accessed
@@ skipping 204 matching lines @@
     }
 
     ConstructorElementX constructor = enclosingElement;
     bool isConstConstructor = constructor.isConst;
     bool isValidAsConstant = isConstConstructor;
     ConstructorResult result =
         resolveRedirectingFactory(node, inConstContext: isConstConstructor);
     ConstructorElement redirectionTarget = result.element;
     constructor.immediateRedirectionTarget = redirectionTarget;
 
-    Node constructorReference = node.constructorReference;
     if (result.isDeferred) {
       constructor.redirectionDeferredPrefix = result.prefix;
     }
 
     registry.setRedirectingTargetConstructor(node, redirectionTarget);
     switch (result.kind) {
       case ConstructorResultKind.GENERATIVE:
       case ConstructorResultKind.FACTORY:
         // Register a post process to check for cycles in the redirection chain
         // and set the actual generative constructor at the end of the chain.
@@ skipping 183 matching lines @@
     } else {
       argumentsResult = resolveArguments(node.send.argumentsNode);
     }
     // TODO(johnniwinther): Avoid the need for a [Selector].
     Selector selector = resolveSelector(node.send, constructor);
     CallStructure callStructure = selector.callStructure;
     registry.useElement(node.send, constructor);
 
     DartType type = result.type;
     ConstructorAccessKind kind;
-    NewStructure newStructure;
     bool isInvalid = false;
     switch (result.kind) {
       case ConstructorResultKind.GENERATIVE:
         // Ensure that the signature of [constructor] has been computed.
         constructor.computeType(resolution);
         if (!callStructure.signatureApplies(constructor.functionSignature)) {
           isInvalid = true;
           kind = ConstructorAccessKind.INCOMPATIBLE;
           registry.registerFeature(Feature.THROW_NO_SUCH_METHOD);
         } else {
@@ skipping 891 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);
 }