frontend 0.4.0

rustc's frontend with no LLVM and no std: parsing through MIR, as a library
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// `#![no_std]`: these arrive with the standard prelude and name no path, so a `std::`
// search cannot see them - and a `#[derive]` can use them without the name appearing
// in this file at all, which is why they are not trimmed by inspection.
use alloc::borrow::ToOwned;
use alloc::boxed::Box;
use alloc::format;
use alloc::string::{String, ToString};
use alloc::vec;
use alloc::vec::Vec;

use super::*;

type Element = (usize, &'static str);

fn test_map() -> Vec<Element> {
    let mut data = vec![(3, "three-a"), (0, "zero"), (3, "three-b"), (22, "twenty-two")];
    data.sort_by_key(get_key);
    data
}

fn get_key(data: &Element) -> usize {
    data.0
}

#[test]
fn binary_search_slice_test() {
    let map = test_map();
    assert_eq!(binary_search_slice(&map, get_key, &0), &[(0, "zero")]);
    assert_eq!(binary_search_slice(&map, get_key, &1), &[]);
    assert_eq!(binary_search_slice(&map, get_key, &3), &[(3, "three-a"), (3, "three-b")]);
    assert_eq!(binary_search_slice(&map, get_key, &22), &[(22, "twenty-two")]);
    assert_eq!(binary_search_slice(&map, get_key, &23), &[]);
}