With few exceptions lines like 

use strict;
use warnings;
use Class::Struct;

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should be listed at the beginning of a file, not inside of subroutines. I'm not sure, but use of a class inside a subroutine might lead to problems because the implied 'require' would create closures instead of sub-subroutines.

In reply to Re: Error with using structs as subroutine parameters by jethro
in thread Error with using structs as subroutine parameters by dellnak

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