NCurses with Supply (broken)

timer2.p6

use v6;
use lib 'lib';
use NCurses;

my $win = initscr;
die "Failed to initialize ncurses\n" unless $win.defined;

my $timer = Supply.interval(1);
$timer.tap({
    mvaddstr( 3, 5, "Test $_");
    nc_refresh;
});

# Wait for a keypress
while getch() < 0 { };

endwin;