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use infer::InferCtxt;
use ty::{self, Ty, TyCtxt};
use hir::def_id::DefId;
use super::{FulfillmentContext, FulfillmentError};
use super::{ObligationCause, PredicateObligation};
pub trait TraitEngine<'tcx>: 'tcx {
fn normalize_projection_type(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
projection_ty: ty::ProjectionTy<'tcx>,
cause: ObligationCause<'tcx>,
) -> Ty<'tcx>;
fn register_bound(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
ty: Ty<'tcx>,
def_id: DefId,
cause: ObligationCause<'tcx>,
);
fn register_predicate_obligation(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
obligation: PredicateObligation<'tcx>,
);
fn select_all_or_error(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
) -> Result<(), Vec<FulfillmentError<'tcx>>>;
fn select_where_possible(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
) -> Result<(), Vec<FulfillmentError<'tcx>>>;
fn pending_obligations(&self) -> Vec<PredicateObligation<'tcx>>;
}
pub trait TraitEngineExt<'tcx> {
fn register_predicate_obligations(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
obligations: impl IntoIterator<Item = PredicateObligation<'tcx>>,
);
}
impl<T: ?Sized + TraitEngine<'tcx>> TraitEngineExt<'tcx> for T {
fn register_predicate_obligations(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
obligations: impl IntoIterator<Item = PredicateObligation<'tcx>>,
) {
for obligation in obligations {
self.register_predicate_obligation(infcx, obligation);
}
}
}
impl dyn TraitEngine<'tcx> {
pub fn new(_tcx: TyCtxt<'_, '_, 'tcx>) -> Box<Self> {
Box::new(FulfillmentContext::new())
}
}