pub type Code = fn(self_: i64, args: i64) -> i64;
The code of a function: (param $self i64) (param $args i64) (result i64) (l0-design.md §12). It borrows both handles and answers an owned one, or calls throw.
(param $self i64) (param $args i64) (result i64)
l0-design.md
throw