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use strict;
use warnings;
...
$name = $person->name;
print "hello, ";
print $name;

Global symbol "$person" requires explicit package name at test.pl line
+ 5.
Global symbol "$name" requires explicit package name at test.pl line 6
+.
Global symbol "$person" requires explicit package name at test.pl line
+ 6.
Global symbol "$name" requires explicit package name at test.pl line 8
+.