Which of the output lines you provided are the result of the warn $self->filename call?
warn 'WARN:'.$self->filename;
97% ... WARN:(eval 657)[(eval 656)[/ExtUtils/MM_Unix.pm:2920]:1] at /D
+evel/NYTProf/FileInfo.pm line 431.
WARN:(eval 657)[(eval 656)[/ExtUtils/MM_Unix.pm:2920]:1] at /Devel/NYT
+Prof/FileInfo.pm line 431.
WARN: at /Devel/NYTProf/FileInfo.pm line 431. # NO FILENAME!
Use of uninitialized value in numeric gt (>) at /Devel/NYTProf/Reader.
+pm line 184.
98% ... WARN:(eval 1724)[/Module/Metadata.pm:13] at /Devel/NYTProf/Fil
+eInfo.pm line 431.
WARN:(eval 1724)[/Module/Metadata.pm:13] at /Devel/NYTProf/FileInfo.pm
+ line 431.
98% ... WARN:(eval 2699)[(eval 2698)[/Module/Metadata.pm:13]:6] at /
+Devel/NYTProf/FileInfo.pm line 431.
WARN:(eval 2699)[(eval 2698)[/Module/Metadata.pm:13]:6] at /Devel/NYTP
+rof/FileInfo.pm line 431.
WARN: at /Devel/NYTProf/FileInfo.pm line 431. # NO FILENAME!
Use of uninitialized value in numeric gt (>) at /Devel/NYTProf/Reader.
+pm line 184.
Also, what does a "normal" filename look like when printed?
Either the it's the full path to a perl module, or one of those eval lines with parens and brackets.
Another question is why your code is using what appears to be a module installation process?
I'm using ExtUtils::Installed. ExtUtils::Installed::new calls ExtUtils::Installed::_make_entry which calls ExtUtils::MM_Unix::parse_version.
Maybe I found another bug by analyzing Perl? (This time in NYTProf)
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