Clean up analyzer hints.

pkg/analysis_server/lib/src/services/completion/arglist_computer.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.
 
 library services.completion.computer.dart.arglist;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart'
     hide Element, ElementKind;
@@ skipping 37 matching lines @@
   @override
   _ArgListSuggestionBuilder visitArgumentList(ArgumentList node) {
     Token leftParen = node.leftParenthesis;
     if (leftParen != null && request.offset > leftParen.offset) {
       AstNode parent = node.parent;
       if (parent is MethodInvocation) {
         SimpleIdentifier selector = parent.methodName;
         if (selector != null) {
           String name = selector.name;
           if (name != null && name.length > 0) {
-            if (parent.period == null) {
+            if (parent.operator == null) {
               /*
                * If a local declaration is found, then return null
                * indicating that suggestions were added
                * and no further action is necessary
                */
               if (new _LocalDeclarationFinder(request, request.offset, name)
                   .visit(node)) {
                 return null;
               }
             } else {
@@ skipping 123 matching lines @@
       if (id != null) {
         String name = id.name;
         if (name != null && name.length > 0) {
           return name;
         }
       }
     }
     return 'dynamic';
   }
 }