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ll_new( $x, < any perl expression > )

ll_new( $x, memoize( sub { < any perl expression > } ) )

ll_new( $x, sub { < any perl expression > } )

$fibs = ll_new(
  0,
...
    }
  )
);

$fibs = ll_new( 0, ll_new( 1, ll_add( tail( $fibs ), $fibs ) ) );

fibs = 0:1:[a+b| (a,b) <- zip fibs (tail fibs) ]