Package perl-PadWalker: Information

PadWalker is a module which allows you to inspect (and even change!)
lexical variables in any subroutine which called you. It will only
show those variables which are in scope at the point of the call.

PadWalker is particularly useful for debugging. It's even
used by Perl's built-in debugger. (It can also be used
for evil, of course.)

I wouldn't recommend using PadWalker directly in production
code, but it's your call. Some of the modules that use
PadWalker internally are certainly safe for and useful
in production.

Package perl-PadWalker: Information

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