1 //! Queries for checking whether a type implements one of a few common traits.
3 use rustc::middle::lang_items;
4 use rustc::ty::{self, Ty, TyCtxt};
5 use rustc_infer::infer::TyCtxtInferExt;
6 use rustc_infer::traits;
7 use rustc_span::DUMMY_SP;
9 fn is_copy_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
10 is_item_raw(tcx, query, lang_items::CopyTraitLangItem)
13 fn is_sized_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
14 is_item_raw(tcx, query, lang_items::SizedTraitLangItem)
17 fn is_freeze_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
18 is_item_raw(tcx, query, lang_items::FreezeTraitLangItem)
23 query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>,
24 item: lang_items::LangItem,
26 let (param_env, ty) = query.into_parts();
27 let trait_def_id = tcx.require_lang_item(item, None);
28 tcx.infer_ctxt().enter(|infcx| {
29 traits::type_known_to_meet_bound_modulo_regions(
39 pub(crate) fn provide(providers: &mut ty::query::Providers<'_>) {
40 *providers = ty::query::Providers { is_copy_raw, is_sized_raw, is_freeze_raw, ..*providers };