Bug #118590 for HTML-Template-Expr: HTML::Template::Expr seems to fail some shallow parts of tree since version 0.6

Hi folks, I was just troubleshooting an installation at work and figuring out why some values weren't populating on our templates in a new CentOS 6 installation. I compared the "HTML::Template::Expr" version "0.07" we had on the old CentOS 5 server against the same "0.07" version we have on the new CentOS 6 server and I discovered that someone must have made a fix on the old machine that wasn't documented and I had to discover the hard way... Basically, the fix is this patch:200c200 <     my @stack = @$tree; --- Show quoted text
This inside this sub: _expr_vars I noticed that since version "0.06" the module switched from:  while(@_) {     my $node = shift; To this:  my $tree = shift;   my @stack = @$tree;   while (@stack) {       my $node = shift @stack; The fact that we grab the elements of $tree into the @stack, instead of grabbing the $tree itself into the @stack, causes the shallow levels not to render. In addition, I get a few warnings that I think are related to this problem:Use of uninitialized value $_ in substitution (s///) at /usr/local/share/perl5/HTML/Template.pm line 2801. Use of uninitialized value $_ in substitution (s///) at /usr/local/share/perl5/HTML/Template.pm line 2802. Use of uninitialized value $_ in substitution (s///) at /usr/local/share/perl5/HTML/Template.pm line 2803. Use of uninitialized value $_ in substitution (s///) at /usr/local/share/perl5/HTML/Template.pm line 2804. Use of uninitialized value $_ in substitution (s///) at /usr/local/share/perl5/HTML/Template.pm line 2805. Use of uninitialized value $_ in concatenation (.) or string at /usr/local/share/perl5/HTML/Template.pm line 2807. Use of uninitialized value in concatenation (.) or string at /usr/local/share/perl5/HTML/Template.pm line 2713. Use of uninitialized value in concatenation (.) or string at /usr/local/share/perl5/HTML/Template.pm line 2713. Use of uninitialized value in concatenation (.) or string at /usr/local/share/perl5/HTML/Template.pm line 2713. Use of uninitialized value in concatenation (.) or string at /usr/local/share/perl5/HTML/Template.pm line 2713. I don't fully understand the way the module works but it seems like this might be a bug and the patch that someone had come up with may be a good one... Here are details about the versions we use (some XXX redactions):OS:   # uname -u   Linux XXXXX 2.6.32-573.12.1.el6.x86_64 #1 SMP Tue Dec 15 21:19:08 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Parent module versions used and tested with:/usr/local/share/perl5/HTML/Template.pm   package HTML::Template;   $HTML::Template::VERSION = '2.95'; /usr/lib/perl5/site_perl/5.8.5/HTML/Template.pm   package HTML::Template;   $HTML::Template::VERSION = '2.9'; The HTML::Template::Expr module versions used:/usr/local/share/perl5/HTML/Template/Expr.pm   package HTML::Template::Expr;   $VERSION = '0.07';   use HTML::Template 2.4; /usr/lib/perl5/site_perl/5.8.5/HTML/Template/Expr.pm   package HTML::Template::Expr;   $VERSION = '0.07';   use HTML::Template 2.4; The Perl version on one of my machines (where I was trying to get the same code run like in the old one) is:# perl -v This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi PERL VERSION ] IS: 5.010001 PERL VERSION V IS: v5.10.1 On the old machine I had something like 5.8.8 Thank you for maintaining the module and I hope that this information helps, if the module indeed has a problem... Yours, Georgy.