What do you get if you inspect $@ in case an error is thrown? (IIRC, the error messages do include line number information.)
Update: for example, when I add the line
print $@ if $@;
to your code snippet, and with a sample.xml containing
<?xml version="1.0" encoding="UTF-8"?>
<mydoc>
<foo>
<bar>...
</bar_>
</foo>
</mydoc>
I do get:
$ ./840913.pl
sample.xml:5: parser error : expected '>'
</bar_>
^ at ./840913.pl line 11
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