Scanner/parser support for DEP 9 (null-aware operators).

pkg/analyzer/lib/src/generated/ast.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.ast;
 
 import 'dart:collection';
@@ skipping 18167 matching lines @@
     _visitNode(node.operand);
     return null;
   }
 
   @override
   Object visitPropertyAccess(PropertyAccess node) {
     if (node.isCascaded) {
       _writer.print("..");
     } else {
       _visitNode(node.target);
-      _writer.print('.');
+      _writer.print(node.operator.lexeme);
     }
     _visitNode(node.propertyName);
     return null;
   }
 
   @override
   Object visitRedirectingConstructorInvocation(
       RedirectingConstructorInvocation node) {
     _writer.print("this");
     _visitNodeWithPrefix(".", node.constructorName);
@@ skipping 1888 matching lines @@
   }
 
   @override
   accept(AstVisitor visitor) => visitor.visitYieldStatement(this);
 
   @override
   void visitChildren(AstVisitor visitor) {
     _safelyVisitChild(_expression, visitor);
   }
 }