51 lines
1.6 KiB
Rust
51 lines
1.6 KiB
Rust
//! Queries for checking whether a type implements one of a few common traits.
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use rustc_hir::lang_items::LangItem;
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use rustc_infer::infer::TyCtxtInferExt;
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use rustc_middle::query::Providers;
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use rustc_middle::ty::{self, Ty, TyCtxt};
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use rustc_trait_selection::traits;
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fn is_copy_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::PseudoCanonicalInput<'tcx, Ty<'tcx>>) -> bool {
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is_item_raw(tcx, query, LangItem::Copy)
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}
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fn is_use_cloned_raw<'tcx>(
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tcx: TyCtxt<'tcx>,
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query: ty::PseudoCanonicalInput<'tcx, Ty<'tcx>>,
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) -> bool {
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is_item_raw(tcx, query, LangItem::UseCloned)
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}
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fn is_sized_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::PseudoCanonicalInput<'tcx, Ty<'tcx>>) -> bool {
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is_item_raw(tcx, query, LangItem::Sized)
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}
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fn is_freeze_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::PseudoCanonicalInput<'tcx, Ty<'tcx>>) -> bool {
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is_item_raw(tcx, query, LangItem::Freeze)
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}
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fn is_unpin_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::PseudoCanonicalInput<'tcx, Ty<'tcx>>) -> bool {
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is_item_raw(tcx, query, LangItem::Unpin)
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}
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fn is_item_raw<'tcx>(
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tcx: TyCtxt<'tcx>,
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query: ty::PseudoCanonicalInput<'tcx, Ty<'tcx>>,
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item: LangItem,
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) -> bool {
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let (infcx, param_env) = tcx.infer_ctxt().build_with_typing_env(query.typing_env);
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let trait_def_id = tcx.require_lang_item(item, None);
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traits::type_known_to_meet_bound_modulo_regions(&infcx, param_env, query.value, trait_def_id)
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}
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pub(crate) fn provide(providers: &mut Providers) {
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*providers = Providers {
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is_copy_raw,
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is_use_cloned_raw,
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is_sized_raw,
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is_freeze_raw,
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is_unpin_raw,
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..*providers
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};
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}
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