Add AccessSemantics.INVALID for invalid expressions.

pkg/compiler/lib/src/resolution/access_semantics.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.
 
 // TODO(johnniwinther): Temporarily copied from analyzer2dart. Merge when
 // we shared code with the analyzer and this semantic visitor is complete.
 
 /**
  * Code for classifying the semantics of identifiers appearing in a Dart file.
  */
@@ skipping 125 matching lines @@
   COMPOUND,
 
   /// The destination of the access is a compile-time constant.
   CONSTANT,
 
   /// The destination of the access is unresolved in a static context.
   UNRESOLVED,
 
   /// The destination of the access is unresolved super access.
   UNRESOLVED_SUPER,
+
+  /// The destination is invalid as an access. For instance a prefix used
+  /// as an expression.
+  INVALID,
 }
 
 enum CompoundAccessKind {
   /// Read from a static getter and write to a static setter.
   STATIC_GETTER_SETTER,
   /// Read from a static method (closurize) and write to a static setter.
   STATIC_METHOD_SETTER,
 
   /// Read from an unresolved static getter and write to a static setter.
   UNRESOLVED_STATIC_GETTER,
@@ skipping 194 matching lines @@
       : super._(AccessKind.TOPLEVEL_GETTER);
 
   StaticAccess.topLevelSetter(MethodElement this.element)
       : super._(AccessKind.TOPLEVEL_SETTER);
 
   StaticAccess.unresolved(this.element)
       : super._(AccessKind.UNRESOLVED);
 
   StaticAccess.unresolvedSuper(this.element)
       : super._(AccessKind.UNRESOLVED_SUPER);
+
+  StaticAccess.invalid(this.element)
+      : super._(AccessKind.INVALID);
 }
 
 class CompoundAccessSemantics extends AccessSemantics {
   final CompoundAccessKind compoundAccessKind;
   final Element getter;
   final Element setter;
 
   CompoundAccessSemantics(this.compoundAccessKind,
                           this.getter,
                           this.setter)
@@ skipping 162 matching lines @@
 
   RedirectingFactoryConstructorAccessSemantics(
       ConstructorAccessKind kind,
       Element element,
       DartType type,
       this.effectiveTargetSemantics)
       : super(kind, element, type);
 }