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 core::any::Any;

use crate::rustc_errors::{Diag, DiagCtxtHandle, Diagnostic, Level};
use crate::rustc_session::Session;

pub struct DiagAndSess<'sess> {
    pub callback: Box<
        // `+ DynSend` dropped: no longer an auto trait (see `rustc_data_structures/marker.rs`).
        dyn for<'b> FnOnce(DiagCtxtHandle<'b>, Level, &dyn Any) -> Diag<'b, ()> + 'static,
    >,
    pub sess: &'sess Session,
}

impl<'a> Diagnostic<'a, ()> for DiagAndSess<'_> {
    fn into_diag(self, dcx: DiagCtxtHandle<'a>, level: Level) -> Diag<'a, ()> {
        (self.callback)(dcx, level, self.sess)
    }
}