Some minor fixes caught by the bots, suppress a test that needs more investigation

pkg/compiler/lib/src/scanner/token.dart

 // Copyright (c) 2011, 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.
 
 part of scanner;
 
 const int EOF_TOKEN = 0;
 
 const int KEYWORD_TOKEN = $k;
 const int IDENTIFIER_TOKEN = $a;
@@ skipping 253 matching lines @@
 
 // TODO(sigmund): delete once we enable null-aware-operators by default.
 class UnsupportedNullAwareToken extends ErrorToken {
   final String operator;
 
   UnsupportedNullAwareToken(this.operator, int charOffset)
       : super(charOffset);
 
   String toString() => "UnsupportedNullAwareToken($operator)";
 
-  String get assertionMessage => "'$opreator' isn't supported without "
+  String get assertionMessage => "'$operator' isn't supported without "
       "the --enable-null-aware-operators flag.";
 
   int get charCount => operator.length;
 }
 
 class UnterminatedToken extends ErrorToken {
   final String start;
   final int endOffset;
 
   UnterminatedToken(this.start, int charOffset, this.endOffset)
@@ skipping 461 matching lines @@
 
 const PrecedenceInfo STRING_INTERPOLATION_IDENTIFIER_INFO =
   const PrecedenceInfo('\$', 0,
                        STRING_INTERPOLATION_IDENTIFIER_TOKEN);
 
 const PrecedenceInfo HEXADECIMAL_INFO =
   const PrecedenceInfo('hexadecimal', 0, HEXADECIMAL_TOKEN);
 
 const PrecedenceInfo COMMENT_INFO =
   const PrecedenceInfo('comment', 0, COMMENT_TOKEN);