fix a bug in cyclic dependent rules.

src/parse_timestamp.cc

@@ -60,7 +60,7 @@ const Rule qp = qi::lit('\\') >> (vchar | ws); // quoted pair
 
 // Comments
 const Rule ctext = qi::omit[ qi::char_ - qi::char_("()\\") ];
-const Rule ccontent = ctext | qp | comment;
+const Rule ccontent = ctext | qp | comment.alias();
 const Rule comment = qi::lit('(') >> *(ws | ccontent) >> -ws >> qi::lit(')');
 const Rule cfws = qi::omit[ ( +(+ws >> comment >> +ws)) | ws ];
 
@@ -180,7 +180,7 @@ timestamp* parse_timestamp(const std::string& s)
         { "Thu, 20 Oct 1992 11:22:33 +0000", 
           "Sun, 20 Oct 1992 11:45:15 -0500" }, date_time,  "DateTime" );
 ***/
-    
+    std::cerr << " \n === TimeStamp \"" << s << "\" to parse...\n";
     std::string::const_iterator begin = s.begin();
     bool okay = qi::parse(begin, s.end(), date_time, *ts );
     LOG << " \n === TimeStamp \"" << s << "\" is " << (okay?"okay":"NOT OKAY");