You could do just as well inside another subroutine instead of just a bare block

I'm not seeing that:

use warnings;
use strict;

use warnings;
use strict;

sub outer {
    my $data = 10;

    sub test {
        print $data;
    }

}

outer();
test();


--output:--
Variable "$data" will not stay shared at t.pl line 8.
10
[download]

Nor here:

use warnings;
use strict;

sub outer {
    my $data = 10;

    sub test {
        print $data;
    }

    test();

}

outer();


--output:--
Variable "$data" will not stay shared at t.pl line 8.
10
[download]