Macro destruct_tuple

macro_rules! destruct_tuple {
    ($($field:ident),* in $tup:expr) => { ... };
}

Allows destructuring tuples in const contexts, regardless of items having drop glue.

This is mainly useful to allow generic functions to return tuples without being then stuck without a way to pull them back apart.

Example

use const_util::*;
const fn pair_to_arr<T>(pair: (T, T)) -> [T; 2] {
    destruct_tuple! { a, b in pair }
    [a, b]
}
assert_eq!(
    pair_to_arr((String::from("ABC"), String::new())),
    ["ABC", ""],
);