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  1. or download this
    package Foo;
use v5.36;
...
    say "Optionally imported.";
}
1;
  2. or download this
    #!/usr/bin/env perl
use v5.36;

use Foo;
always_imported; # works
  3. or download this
    #!/usr/bin/env perl
use v5.36;

use Foo qw/optionally_imported/;
always_imported; # bareword error ("always_imported" sub not defined)