#![feature(array_windows)]
#![feature(if_let_guard)]
#![feature(let_chains)]
#![warn(unreachable_pub)]
use rustc_hir::lang_items::LangItem;
use rustc_middle::query::TyCtxtAt;
use rustc_middle::ty::adjustment::CustomCoerceUnsized;
use rustc_middle::ty::{self, Ty};
use rustc_middle::util::Providers;
use rustc_middle::{bug, traits};
use rustc_span::ErrorGuaranteed;
mod collector;
mod errors;
mod partitioning;
mod polymorphize;
mod util;
rustc_fluent_macro::fluent_messages! { "../messages.ftl" }
fn custom_coerce_unsize_info<'tcx>(
tcx: TyCtxtAt<'tcx>,
source_ty: Ty<'tcx>,
target_ty: Ty<'tcx>,
) -> Result<CustomCoerceUnsized, ErrorGuaranteed> {
let trait_ref = ty::TraitRef::new(
tcx.tcx,
tcx.require_lang_item(LangItem::CoerceUnsized, Some(tcx.span)),
[source_ty, target_ty],
);
match tcx.codegen_select_candidate((ty::ParamEnv::reveal_all(), trait_ref)) {
Ok(traits::ImplSource::UserDefined(traits::ImplSourceUserDefinedData {
impl_def_id,
..
})) => Ok(tcx.coerce_unsized_info(impl_def_id)?.custom_kind.unwrap()),
impl_source => {
bug!("invalid `CoerceUnsized` impl_source: {:?}", impl_source);
}
}
}
pub fn provide(providers: &mut Providers) {
partitioning::provide(providers);
polymorphize::provide(providers);
}