Element definition

With Pair

A Pair (constructed with the => operator) can be treated as a cons cell, and thus used to build a linked lists:

my $elem = 42 => $nextelem;

However, because this is not the primary purpose of the Pair type, it suffers from the following limitations:

With custom type

For more flexibility, one would create a custom type:

class Cell {
    has      $.value is rw;
    has Cell $.next  is rw;
    
    # ...convenience methods here...
}

sub cons ($value, $next) { Cell.new(:$value, :$next) }

my $list = cons 10, (cons 20, (cons 30, Nil));