Use destructuring assignments for named parameters (#180)

lib/src/closure/closure_annotator.dart

 // Copyright (c) 2015, 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 dev_compiler.src.closure.closure_codegen;
 
 import 'package:analyzer/analyzer.dart' show ParameterKind;
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/resolver.dart' show TypeProvider;
 
@@ skipping 18 matching lines @@
   ClosureAnnotation closureAnnotationForTypeDef(FunctionTypeAliasElement e) =>
       new ClosureAnnotation(
           type: _closureTypeForDartType(e.type, forceTypeDefExpansion: true),
           isTypedef: true);
 
   ClosureAnnotation closureAnnotationForDefaultConstructor(ClassElement e) =>
       new ClosureAnnotation(
           superType: _closureTypeForDartType(e.supertype),
           interfaces: e.interfaces.map(_closureTypeForDartType).toList());
 
+  // TODO(ochafik): Handle destructured params when Closure supports it.
   ClosureAnnotation closureAnnotationFor(
       ExecutableElement e, String namedArgsMapName) {
     var paramTypes = <String, ClosureType>{};
     var namedArgs = <String, ClosureType>{};
     for (var param in e.parameters) {
       var t = _closureTypeForDartType(param.type);
       switch (param.parameterKind) {
         case ParameterKind.NAMED:
           namedArgs[param.name] = t.orUndefined();
           break;
@@ skipping 85 matching lines @@
     if (type is InterfaceType) {
       return _closureTypeForClass(type.element, type);
     }
     return new ClosureType.unknown();
   }
 
   /// TODO(ochafik): Use a package-and-file-uri-dependent naming, since libraries can collide.
   String _getFullName(ClassElement type) =>
       type.library.name == '' ? type.name : '${type.library.name}.${type.name}';
 }