This is because until 5.8.4, the use strict;
wasn't being propagated into the code within the regex; now it
is, so it complains that the var hasn't been declared (because the declaration doesn't come into effect until the statement following the our
The error message is a bit misleading due the
way Perl code within regexes is currently handled - something I'm
hoping to fix for 5.10.0.
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