O.K. Some might say that this is nitpicking. But anyway. I just wanted to elucidate that Perl has some features that may cause trouble if not used with some discipline.

Compare this:

#!/usr/bin/env perl
use strict;
use warnings;
use feature qw(say);;

my $foo = qq(bar);

__END__
[download]

It works like a charm. Nothing special.

But in some other languages like in my new useless favorite waste of time something similar doesn't even compile:

package main

func main() {
    foo := "bar"
}
[download]

./prog.go:4:2: foo declared and not used

Go build failed.
[download]

You need to say something like:

package main

import "fmt"

func main() {
    foo := "bar"
    fmt.Println(foo)
}
[download]

bar

Program exited.
[download]

The same applies for importing and not using a module or declaring/assigning a variable twice in the same scope, like in the example you provided.

This is no judgement. But everything has it's price - even flexibility.

Best regards, Karl

P.S.: Where you ever forced to search for orphaned variables in a large Perl code base?