Are you by chance running an incredibly old version of XML::Simple?

The lock() function was added to allow XML::Simple to be thread safe under the 5.005 threading model while still working with older Perls. That threading model was replaced with a new model in Perl 5.6 and the lock function was removed from XML Simple in October 2002.

Given that XML::Simple uses Test::More extensively in its own test suite, I'm pretty sure they get along OK :-)

In reply to Re: Test::More and XML::Simple by grantm
in thread Test::More and XML::Simple by hypochrismutreefuzz

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