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use crate::infer::InferCtxt;
use crate::traits::Obligation;
use rustc_data_structures::fx::FxHashMap;
use rustc_hir::def_id::DefId;
use rustc_middle::ty::{self, ToPredicate, Ty};
use super::FulfillmentError;
use super::{ObligationCause, PredicateObligation};
pub trait TraitEngine<'tcx>: 'tcx {
/// Requires that `ty` must implement the trait with `def_id` in
/// the given environment. This trait must not have any type
/// parameters (except for `Self`).
fn register_bound(
&mut self,
infcx: &InferCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
ty: Ty<'tcx>,
def_id: DefId,
cause: ObligationCause<'tcx>,
) {
let trait_ref = infcx.tcx.mk_trait_ref(def_id, [ty]);
self.register_predicate_obligation(
infcx,
Obligation {
cause,
recursion_depth: 0,
param_env,
predicate: ty::Binder::dummy(trait_ref).without_const().to_predicate(infcx.tcx),
},
);
}
fn register_predicate_obligation(
&mut self,
infcx: &InferCtxt<'tcx>,
obligation: PredicateObligation<'tcx>,
);
fn select_all_or_error(&mut self, infcx: &InferCtxt<'tcx>) -> Vec<FulfillmentError<'tcx>>;
fn select_where_possible(&mut self, infcx: &InferCtxt<'tcx>) -> Vec<FulfillmentError<'tcx>>;
fn pending_obligations(&self) -> Vec<PredicateObligation<'tcx>>;
fn relationships(&mut self) -> &mut FxHashMap<ty::TyVid, ty::FoundRelationships>;
}
pub trait TraitEngineExt<'tcx> {
fn register_predicate_obligations(
&mut self,
infcx: &InferCtxt<'tcx>,
obligations: impl IntoIterator<Item = PredicateObligation<'tcx>>,
);
}
impl<'tcx, T: ?Sized + TraitEngine<'tcx>> TraitEngineExt<'tcx> for T {
fn register_predicate_obligations(
&mut self,
infcx: &InferCtxt<'tcx>,
obligations: impl IntoIterator<Item = PredicateObligation<'tcx>>,
) {
for obligation in obligations {
self.register_predicate_obligation(infcx, obligation);
}
}
}
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