would this do the same thing:

If you had been in main initially, yes.

Speaking of similar things, I didn't answer an earlier question.

sub Foo::Bar::f {}
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is very similar to

{
   package Foo::Bar;
   sub f {}
}
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But the code is compiled in a different package. This affects caller and other things:

use strict;
use warnings;

sub Foo::f {
   our $var;
   print(__PACKAGE__, "\n");
   print("$var\n");
}

{
   package Bar;
   sub f {
      our $var;
      print(__PACKAGE__, "\n");
      print("$var\n");
   }
}

$main::var = 'main!';
$Foo::var = 'foo!';
$Bar::var = 'bar!';

Foo::f();
# main
# main!

Bar::f();
# Bar
# bar!
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