Remove use of Element in ResolutionEnqueuerListener.

pkg/compiler/lib/src/elements/entities.dart

 // Copyright (c) 2016, 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 entities;
 
 import '../common.dart';
 
 /// Abstract interface for entities.
 ///
 /// Implement this directly if the entity is not a Dart language entity.
 /// Entities defined within the Dart language should implement [Element].
 ///
 /// For instance, the JavaScript backend need to create synthetic variables for
 /// calling intercepted classes and such variables do not correspond to an
 /// entity in the Dart source code nor in the terminology of the Dart language
 /// and should therefore implement [Entity] directly.
 abstract class Entity implements Spannable {
   String get name;
 }
 
 /// Stripped down super interface for library like entities.
 ///
 /// Currently only [LibraryElement] but later also kernel based Dart classes
 /// and/or Dart-in-JS classes.
-abstract class LibraryEntity extends Entity {}
+abstract class LibraryEntity extends Entity {
+  /// Return the canonical uri that identifies this library.
+  Uri get canonicalUri;
+}
 
 /// Stripped down super interface for class like entities.
 ///
 /// Currently only [ClassElement] but later also kernel based Dart classes
 /// and/or Dart-in-JS classes.
 abstract class ClassEntity extends Entity {
   /// If this is a normal class, the enclosing library for this class. If this
   /// is a closure class, the enclosing class of the closure for which it was
   /// created.
   LibraryEntity get library;
@@ skipping 39 matching lines @@
 
   /// Whether this is a getter.
   bool get isGetter;
 
   /// Whether this is a setter.
   bool get isSetter;
 
   /// Whether this member is assignable, i.e. a non-final field.
   bool get isAssignable;
 
-  /// The enclosing class if this is a constuctor, instance member or
+  /// Whether this member is constant, i.e. a constant field or constructor.
+  bool get isConst;
+
+  /// The enclosing class if this is a constructor, instance member or
   /// static member of a class.
   ClassEntity get enclosingClass;
 
   /// The enclosing library if this is a library member, otherwise the
   /// enclosing library of the [enclosingClass].
   LibraryEntity get library;
 }
 
 /// Stripped down super interface for field like entities.
 ///
@@ skipping 41 matching lines @@
   Entity get executableContext;
 
   /// The outermost member that contains this element.
   ///
   /// For top level, static or instance members, the member context is the
   /// element itself. For parameters, local variables and nested closures, the
   /// member context is the top level, static or instance member in which it is
   /// defined.
   MemberEntity get memberContext;
 }