Macro assertables::assertable_bag_subbag

macro_rules! assertable_bag_subbag {
    ($left:expr, $right:expr $(,)?) => { ... };
    ($left:expr, $right:expr, $($arg:tt)+) => { ... };
}

Assert a bag is a subbag of another.

• When true, return Ok(()).

• Otherwise, return Err with a message and the values of the expressions with their debug representations.

Examples

let a = [1, 1];
let b = [1, 1, 1];
let x = assertable_bag_subbag!(&a, &b);
//-> Ok(())
assert_eq!(x.unwrap(), ());

let a = [1, 1];
let b = [2, 2];
let x = assertable_bag_subbag!(&a, &b);
//-> Err("…")
// assertable failed: `assertable_bag_subbag!(left, right)`
//   left: `[1, 1]`,
//  right: `[2, 2]`
assert_eq!(x.unwrap_err(), "assertable failed: `assertable_bag_subbag!(left, right)`\n  left: `[1, 1]`,\n right: `[2, 2]`".to_string());

let a = [1, 1, 1];
let b = [1, 1];
let x = assertable_bag_subbag!(&a, &b);
//-> Err("…")
// assertable failed: `assertable_bag_subbag!(left, right)`
//   left: `[1, 1, 1]`,
//  right: `[1, 1]`
assert_eq!(x.unwrap_err(), "assertable failed: `assertable_bag_subbag!(left, right)`\n  left: `[1, 1, 1]`,\n right: `[1, 1]`".to_string());

This macro has a second form where a custom message can be provided.

This implementation uses [HashMap] to count items.