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::*;
use crate::rustc_span::create_default_session_globals_then;

#[test]
fn interner_tests() {
    let i = Interner::prefill(&[], &[]);
    // first one is zero:
    assert_eq!(i.intern_str("dog"), Symbol::new(0));
    // re-use gets the same entry, even with a `ByteSymbol`
    assert_eq!(i.intern_byte_str(b"dog"), ByteSymbol::new(0));
    // different string gets a different #:
    assert_eq!(i.intern_byte_str(b"cat"), ByteSymbol::new(1));
    assert_eq!(i.intern_str("cat"), Symbol::new(1));
    // dog is still at zero
    assert_eq!(i.intern_str("dog"), Symbol::new(0));
}

#[test]
fn interner_get() {
    let i = Interner::prefill(&["chicken"], &["cow"]);
    let dog_idx = i.intern_str("dog"); // 2
    let cat_idx = i.intern_str("cat"); // 3
    assert_eq!(i.get_str(Symbol::new(0)), "chicken");
    assert_eq!(i.get_str(Symbol::new(1)), "cow");
    assert_eq!(i.get_str(cat_idx), "cat");
    assert_eq!(i.get_str(dog_idx), "dog");
}

#[test]
fn without_first_quote_test() {
    create_default_session_globals_then(|| {
        let i = Ident::from_str("'break");
        assert_eq!(i.without_first_quote().name, kw::Break);
    });
}