Macro assertables::assert_bag_subbag_as_result

macro_rules! assert_bag_subbag_as_result {
    ($a:expr, $b:expr $(,)?) => { ... };
}

Assert a bag is a subbag of another.

• If true, return Result Ok(()).

• Otherwise, return Result Err with a diagnostic message.

Examples

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

let a = [1, 1];
let b = [2, 2];
let x = assert_bag_subbag_as_result!(&a, &b);
//-> Err(…)
let actual = x.unwrap_err();
let expect = concat!(
    "assertion failed: `assert_bag_subbag!(left_bag, right_bag)`\n",
    "  left_bag label: `&a`,\n",
    "  left_bag debug: `[1, 1]`,\n",
    " right_bag label: `&b`,\n",
    " right_bag debug: `[2, 2]`,\n",
    "            left: `{1: 2}`,\n",
    "           right: `{2: 2}`"
);
assert_eq!(actual, expect);

let a = [1, 1, 1];
let b = [1, 1];
let x = assert_bag_subbag_as_result!(&a, &b);
//-> Err(…)
let actual = x.unwrap_err();
let expect = concat!(
    "assertion failed: `assert_bag_subbag!(left_bag, right_bag)`\n",
    "  left_bag label: `&a`,\n",
    "  left_bag debug: `[1, 1, 1]`,\n",
    " right_bag label: `&b`,\n",
    " right_bag debug: `[1, 1]`,\n",
    "            left: `{1: 3}`,\n",
    "           right: `{1: 2}`"
);
assert_eq!(actual, expect);

This implementation uses [BTreeMap] to count items and sort them.