Hello everyone- I'm a longtime Perl5 developer and the creator of Perl::Critic. More recently, I started working for Coverity, which makes commercial static analysis tools.
Coverity offers a free analysis service through scan.coverity.com. This service is used by thousands of open source projects, including Perl5. I ran a local analysis of the NQP codebase and found 119 potential defects. If you enlist your project at scan.coverity.com you can get all the details. Can't wait until Christmas! -Jeff