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rust/compiler/rustc_monomorphize/src/lib.rs

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