I can create filehandles to strings in Perl 5, how do I do it in Perl 6?

In Perl 5, I can create a filehandle to a string and read or write from the string as if it were a file. This is great for working with tests or templates.

For example:

my $text = "A\nB\nC\n";

open(my $fh, '<', \$text);

while(my $line = readline($fh)){
    print $line;
}

How can I do that in Perl 6? The following doesn't work for Perl 6 (at least not for my instance of Perl6 running on MoarVM 2015.01 from the January 2015 release of Rakudo Star on 64-bit CentOS 6.5):

# Warning: This code does not work
use v6;

my $fh = "A\nB\nC\n";

while (my $line = $fh.get ) {
    $line.say;
}
# Warning: Example of nonfunctional code

I get the error message:

No such method 'get' for invocant of type 'Str'
   in block <unit> at string_fh.p6:5

Anyway, I'd be glad to know if there is a way to do filehandle-style reading and writing from strings in Perl 6 or if that is yet to be implemented.