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lcnr
9cba14b95b
the behavior of the type system not only depends on the current assumptions, but also the currentnphase of the compiler. This is mostly necessary as we need to decide whether and how to reveal opaque types. We track this via the `TypingMode`.
56 lines
1.5 KiB
Rust
56 lines
1.5 KiB
Rust
// tidy-alphabetical-start
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#![feature(array_windows)]
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#![feature(file_buffered)]
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#![feature(if_let_guard)]
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#![feature(impl_trait_in_assoc_type)]
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#![feature(let_chains)]
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#![warn(unreachable_pub)]
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// tidy-alphabetical-end
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use rustc_hir::lang_items::LangItem;
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use rustc_middle::query::TyCtxtAt;
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use rustc_middle::ty::adjustment::CustomCoerceUnsized;
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use rustc_middle::ty::{self, Ty};
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use rustc_middle::util::Providers;
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use rustc_middle::{bug, traits};
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use rustc_span::ErrorGuaranteed;
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mod collector;
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mod errors;
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mod mono_checks;
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mod partitioning;
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mod polymorphize;
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mod util;
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rustc_fluent_macro::fluent_messages! { "../messages.ftl" }
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fn custom_coerce_unsize_info<'tcx>(
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tcx: TyCtxtAt<'tcx>,
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source_ty: Ty<'tcx>,
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target_ty: Ty<'tcx>,
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) -> Result<CustomCoerceUnsized, ErrorGuaranteed> {
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let trait_ref = ty::TraitRef::new(
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tcx.tcx,
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tcx.require_lang_item(LangItem::CoerceUnsized, Some(tcx.span)),
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[source_ty, target_ty],
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);
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match tcx
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.codegen_select_candidate(ty::TypingEnv::fully_monomorphized().as_query_input(trait_ref))
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{
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Ok(traits::ImplSource::UserDefined(traits::ImplSourceUserDefinedData {
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impl_def_id,
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..
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})) => Ok(tcx.coerce_unsized_info(impl_def_id)?.custom_kind.unwrap()),
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impl_source => {
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bug!("invalid `CoerceUnsized` impl_source: {:?}", impl_source);
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}
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}
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}
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pub fn provide(providers: &mut Providers) {
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partitioning::provide(providers);
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polymorphize::provide(providers);
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mono_checks::provide(providers);
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}
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