1 #![feature(array_windows)]
2 #![feature(control_flow_enum)]
3 #![recursion_limit = "256"]
4 #![allow(rustc::potential_query_instability)]
5 #![deny(rustc::untranslatable_diagnostic)]
6 #![deny(rustc::diagnostic_outside_of_impl)]
11 extern crate rustc_middle;
13 use rustc_hir::lang_items::LangItem;
14 use rustc_middle::traits;
15 use rustc_middle::ty::adjustment::CustomCoerceUnsized;
16 use rustc_middle::ty::query::{Providers, TyCtxtAt};
17 use rustc_middle::ty::{self, Ty};
25 fn custom_coerce_unsize_info<'tcx>(
29 ) -> CustomCoerceUnsized {
31 ty::Binder::dummy(tcx.mk_trait_ref(LangItem::CoerceUnsized, [source_ty, target_ty]));
33 match tcx.codegen_select_candidate((ty::ParamEnv::reveal_all(), trait_ref)) {
34 Ok(traits::ImplSource::UserDefined(traits::ImplSourceUserDefinedData {
37 })) => tcx.coerce_unsized_info(impl_def_id).custom_kind.unwrap(),
39 bug!("invalid `CoerceUnsized` impl_source: {:?}", impl_source);
44 pub fn provide(providers: &mut Providers) {
45 partitioning::provide(providers);
46 polymorphize::provide(providers);