lazy-gather

lazy-gather.p6

use v6; 

my @input;

sub stream {
    LEAVE {
        say "it's over";
    }   

    gather {
        for @input {
            take $_; 
        }   
    }   
}

@input = 1 .. 10; 

for stream() {
    .say;
    if $_ == 1 { 
        say 'grabbing an element from @input';
        @input.shift;
    }   
}