id summary reporter owner description type status milestone component version severity resolution keywords cc 5807 Debug build of the program asserts calling iscntrl(c) in boost::spirit::detail::token_printer_debug_for_chars::print(), with c == -127 Stephen Torri Joel de Guzman "When using a hexidecimal string that contains a negative value with the attached parser causes an assert to be thrown when calling iscntrl(c) in boost::spirit::detail::token_printer_debug_for_chars::print(), with c == -127. Disabling debug output allows the program to succeed and produce the following output: successfully parsed 33026 772 Attached is a sample program that causes the error. The program was tested with Visual Studio 2010 (SP1) and Visual Studio 2008 (Boost 1.45)." Bugs closed To Be Determined spirit Boost 1.47.0 Problem fixed