Don't report TODO in analyzer_experimental.

pkg/analyzer_experimental/lib/src/generated/parser.dart

 // 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.parser;
 import 'dart:collection';
 import 'java_core.dart';
 import 'instrumentation.dart';
 import 'error.dart';
 import 'source.dart';
 import 'scanner.dart';
 import 'ast.dart';
@@ skipping 4843 matching lines @@
   /**
    * Look for user defined tasks in comments and convert them into info level analysis issues.
    *
    * @param commentToken the comment token to analyze
    */
   void scrapeTodoComment(Token commentToken) {
     JavaPatternMatcher matcher = new JavaPatternMatcher(TodoCode.TODO_REGEX, commentToken.lexeme);
     if (matcher.find()) {
       int offset = commentToken.offset + matcher.start() + matcher.group(1).length;
       int length = matcher.group(2).length;
-      _errorListener.onError(new AnalysisError.con2(_source, offset, length, TodoCode.TODO, [matcher.group(2)]));
+      // TODO(scheglov) analyzer_experimental users don't expect it
+//      _errorListener.onError(new AnalysisError.con2(_source, offset, length, TodoCode.TODO, [matcher.group(2)]));
     }
   }
 
   /**
    * Parse the 'final', 'const', 'var' or type preceding a variable declaration, starting at the
    * given token, without actually creating a type or changing the current token. Return the token
    * following the type that was parsed, or `null` if the given token is not the first token
    * in a valid type.
    *
    * <pre>
@@ skipping 2040 matching lines @@
       if ("\n" == separator) {
         _writer.print("\n");
         indent();
       } else if (i > 0) {
         _writer.print(separator);
       }
       _writer.print(tokens[i].lexeme);
     }
   }
 }