frontend 0.4.1

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::*;

#[allow(unused)]
#[derive(Debug)]
struct S(u32);

impl PartialEq for S {
    fn eq(&self, _other: &Self) -> bool {
        panic!("shouldn't be called");
    }
}

impl Eq for S {}

#[test]
fn test_uniq() {
    let s1 = S(1);
    let s2 = S(2);
    let s3 = S(3);
    let s4 = S(1); // violates uniqueness

    let v1 = Interned::new_unchecked(&s1);
    let v2 = Interned::new_unchecked(&s2);
    let v3a = Interned::new_unchecked(&s3);
    let v3b = Interned::new_unchecked(&s3);
    let v4 = Interned::new_unchecked(&s4); // violates uniqueness

    assert_ne!(v1, v2);
    assert_ne!(v2, v3a);
    assert_eq!(v1, v1);
    assert_eq!(v3a, v3b);
    assert_ne!(v1, v4); // same content but different addresses: not equal
}