def numbers: [1,3,7,10];

templates cube
  $ * $ * $ !
end cube

// Using inline array templates (which also allows access to index by $i)
$numbers -> \[i]($ * $i !\) -> !OUT::write
$numbers -> \[i]($ * $ !\) -> !OUT::write
$numbers -> \[i]($ -> cube !\) -> !OUT::write

// Using array literal and deconstructor
[ $numbers... -> $ * $ ] -> !OUT::write
[ $numbers... -> cube ] -> !OUT::write