Using a socket in a thread different from its creating thread

bad-sockets.p6

use v6;

# run this script with the following running in a separate termainal
# (using OpenBSD netcat):
#
#     nc -l localhost 9000 </dev/zero

my $sock = IO::Socket::INET.new(
    :host<localhost>,
    :port(9000),
);

my $p = start {
    # this read will always be empty unless the socket creation is
    # moved inside of the start block
    say $sock.read(8);
    42;
}

$p.result;