Display negate operators correctly in dartdoc.

utils/dartdoc/dartdoc.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.
 
 /**
  * To use it, from this directory, run:
  *
  *     $ ./dartdoc <path to .dart file>
  *
  * This will create a "docs" directory with the docs for your libraries. To
@@ skipping 502 matching lines @@
     }
 
     // Translate specially-named methods: getters, setters, operators.
     var name = method.name;
     if (name.startsWith('get:')) {
       // Getter.
       name = 'get ${name.substring(4)}';
     } else if (name.startsWith('set:')) {
       // Setter.
       name = 'set ${name.substring(4)}';
+    } else if (name == ':negate') {
+      // Dart uses 'negate' for prefix negate operators, not '!'.
+      name = 'operator negate';
     } else {
       // See if it's an operator.
       name = TokenKind.rawOperatorFromMethod(name);
       if (name == null) {
         name = method.name;
       } else {
         name = 'operator $name';
       }
     }
 
@@ skipping 311 matching lines @@
 
     return new md.Element.text('code', name);
   }
 
   // TODO(rnystrom): Move into SourceSpan?
   int getSpanColumn(SourceSpan span) {
     final line = span.file.getLine(span.start);
     return span.file.getColumn(line, span.start);
   }
 }