gistfile1.txt

┌─[tadzik@yavin4]─[~/src/perl6]
└─[%]─> cat myapp.pl 
#module PerlApp {
    our %commands;

#    our sub add_command ($name, $sub) {
#        'almost there'.say;
#        %commands{$name} = $sub; # crashes here
#        'got it'.say;
#    }
    our multi trait_mod:<is>($sub, $cmd, :$command!) {
        'adding a new handler'.say;
        %commands{$cmd} = $sub; # does not work
        'added'.say;
        #add_command($cmd, $sub); # does not work either, see #6
    }
    sub run_app($name, *@args) {
        %commands{$name}(@args);
    }
#}

sub foo() is command('one') {
    say "Hai, I'm command one!";
}

sub bar() is command('two') {
    say "Hai, I'm command two!";
}

sub MAIN(*@args) {
    run_app(@args);
}
┌─[tadzik@yavin4]─[~/src/perl6]
└─[%]─> perl6 myapp.pl 
adding a new handler
===SORRY!===
Null PMC access in can()