function foo(): vec<int> {
    $a = $b as string;
    $a = $b into string;
    $a = $b as int;
    $a = $b into int;
    $a = $b as float;
    $a = $b into float;
    $a = $b as bool;
    $a = $b into bool;
    $a = $b as vec<int>;
    $a = $b into vec<int>;
    $a = $b as vec<int>|dict<string, int>|(string, int);
    $a = $b into vec<int>|dict<string, int>|(string, int);
}