Bug #129367 for XML-SAX: Problem with XML::SAX::PurePerl - if a comment has its ending two dashes on one side, and the > on the other side, of a 4096 byte boundary, it's not recognized as commend end

Steps to reproduce: Create an xml file by running this snippet and redirecting output to a file: ------------------------------------------------------------------------------------------------------- my $start="<tag><inner><!--"; my $big="x"x(4096 - length($start) - 2); my $end="--></inner><second><!--yyyy--></second></tag>"; print $start, $big, $end; ------------------------------------------------------------------------------------------------------- Make sure no other parser is installed, i.e. XML::SAX::PurePerl is the only parser in ParserDetails.ini Then run this on the file: ------------------------------------------------------------------------------------------------------- #!/usr/bin/perl use XML::Simple qw(:strict); foreach $anafile (@ARGV) {     print "--------- $anafile -----------\n";     print XMLin($anafile, (ForceArray => [], KeyAttr => {}) ); } ------------------------------------------------------------------------------------------------------- Result: End tag mismatch (second != inner) [Ln: 1, Col: 4132] This is because the --> that ends the comment within the <inner> tag isn't found, so the comment extends to the next comment end just before </second>. Happens to me on OpenSuse Leap 15.0 and on Ubuntu 18.04.2 LTS, with PurePerl.pm saying $VERSION = '0.99'.