use Future::AsyncAwait;

async sub _count {
    my $i;
    do { $i++ } until $i == 50_000_000;
    say "... counted";
}

say "Before";
_count();
say "After";


Output is:

Before
... counted
After

##</code><code>##

use Future::AsyncAwait;

async sub _add {
    my $one1 = await _count();
    my $one2 = await _count();
    return $one1 + $one2;
}

async sub _count {
    my $i;
    do { $i++ } until $i == 50_000_000;
    say "... counted";
    return 1;
}

say "Before";
my $f = _add();
say "After";
say $f->get;


Output:

Before
... counted
... counted
After
2