if let ty::Adt(def, substs) = ty.kind()
&& Some(def.did()) == tcx.lang_items().pin_type()
&& let ty::Ref(_, _, hir::Mutability::Mut) = substs.type_at(0).kind()
- && let self_ty = infcx.replace_bound_vars_with_fresh_vars(
+ && let self_ty = infcx.instantiate_binder_with_fresh_vars(
fn_call_span,
LateBoundRegionConversionTime::FnCall,
tcx.fn_sig(method_did).subst(tcx, method_substs).input(0),
// so that they represent the view from "inside" the closure.
let user_provided_sig = self
.instantiate_canonical_with_fresh_inference_vars(body.span, &user_provided_poly_sig);
- let user_provided_sig = self.infcx.replace_bound_vars_with_fresh_vars(
+ let user_provided_sig = self.infcx.instantiate_binder_with_fresh_vars(
body.span,
LateBoundRegionConversionTime::FnCall,
user_provided_sig,
let mut wf_tys = FxIndexSet::default();
- let unnormalized_impl_sig = infcx.replace_bound_vars_with_fresh_vars(
+ let unnormalized_impl_sig = infcx.instantiate_binder_with_fresh_vars(
impl_m_span,
infer::HigherRankedType,
tcx.fn_sig(impl_m.def_id).subst_identity(),
let impl_sig = ocx.normalize(
&norm_cause,
param_env,
- infcx.replace_bound_vars_with_fresh_vars(
+ infcx.instantiate_binder_with_fresh_vars(
return_span,
infer::HigherRankedType,
tcx.fn_sig(impl_m.def_id).subst_identity(),
// fnmut vs fnonce. If so, we have to defer further processing.
if self.closure_kind(substs).is_none() {
let closure_sig = substs.as_closure().sig();
- let closure_sig = self.replace_bound_vars_with_fresh_vars(
+ let closure_sig = self.instantiate_binder_with_fresh_vars(
call_expr.span,
infer::FnCall,
closure_sig,
// renormalize the associated types at this point, since they
// previously appeared within a `Binder<>` and hence would not
// have been normalized before.
- let fn_sig = self.replace_bound_vars_with_fresh_vars(call_expr.span, infer::FnCall, fn_sig);
+ let fn_sig = self.instantiate_binder_with_fresh_vars(call_expr.span, infer::FnCall, fn_sig);
let fn_sig = self.normalize(call_expr.span, fn_sig);
// Call the generic checker.
)
.map(|(hir_ty, &supplied_ty)| {
// Instantiate (this part of..) S to S', i.e., with fresh variables.
- self.replace_bound_vars_with_fresh_vars(
+ self.instantiate_binder_with_fresh_vars(
hir_ty.span,
LateBoundRegionConversionTime::FnCall,
// (*) binder moved to here
all_obligations.extend(obligations);
}
- let supplied_output_ty = self.replace_bound_vars_with_fresh_vars(
+ let supplied_output_ty = self.instantiate_binder_with_fresh_vars(
decl.output.span(),
LateBoundRegionConversionTime::FnCall,
supplied_sig.output(),
// placeholder lifetimes with probing, we just replace higher lifetimes
// with fresh vars.
let span = args.get(i).map(|a| a.span).unwrap_or(expr.span);
- let input = self.replace_bound_vars_with_fresh_vars(
+ let input = self.instantiate_binder_with_fresh_vars(
span,
infer::LateBoundRegionConversionTime::FnCall,
fn_sig.input(i),
// Also, as we just want to check sizedness, instead of introducing
// placeholder lifetimes with probing, we just replace higher lifetimes
// with fresh vars.
- let output = self.replace_bound_vars_with_fresh_vars(
+ let output = self.instantiate_binder_with_fresh_vars(
expr.span,
infer::LateBoundRegionConversionTime::FnCall,
fn_sig.output(),
item_segment: &hir::PathSegment<'_>,
poly_trait_ref: ty::PolyTraitRef<'tcx>,
) -> Ty<'tcx> {
- let trait_ref = self.replace_bound_vars_with_fresh_vars(
+ let trait_ref = self.instantiate_binder_with_fresh_vars(
span,
infer::LateBoundRegionConversionTime::AssocTypeProjection(item_def_id),
poly_trait_ref,
let original_poly_trait_ref = principal.with_self_ty(this.tcx, object_ty);
let upcast_poly_trait_ref = this.upcast(original_poly_trait_ref, trait_def_id);
let upcast_trait_ref =
- this.replace_bound_vars_with_fresh_vars(upcast_poly_trait_ref);
+ this.instantiate_binder_with_fresh_vars(upcast_poly_trait_ref);
debug!(
"original_poly_trait_ref={:?} upcast_trait_ref={:?} target_trait={:?}",
original_poly_trait_ref, upcast_trait_ref, trait_def_id
probe::WhereClausePick(poly_trait_ref) => {
// Where clauses can have bound regions in them. We need to instantiate
// those to convert from a poly-trait-ref to a trait-ref.
- self.replace_bound_vars_with_fresh_vars(poly_trait_ref).substs
+ self.instantiate_binder_with_fresh_vars(poly_trait_ref).substs
}
}
}
let sig = self.tcx.fn_sig(def_id).subst(self.tcx, all_substs);
debug!("type scheme substituted, sig={:?}", sig);
- let sig = self.replace_bound_vars_with_fresh_vars(sig);
+ let sig = self.instantiate_binder_with_fresh_vars(sig);
debug!("late-bound lifetimes from method instantiated, sig={:?}", sig);
(sig, method_predicates)
upcast_trait_refs.into_iter().next().unwrap()
}
- fn replace_bound_vars_with_fresh_vars<T>(&self, value: ty::Binder<'tcx, T>) -> T
+ fn instantiate_binder_with_fresh_vars<T>(&self, value: ty::Binder<'tcx, T>) -> T
where
T: TypeFoldable<'tcx> + Copy,
{
- self.fcx.replace_bound_vars_with_fresh_vars(self.span, infer::FnCall, value)
+ self.fcx.instantiate_binder_with_fresh_vars(self.span, infer::FnCall, value)
}
}
// with bound regions.
let fn_sig = tcx.fn_sig(def_id).subst(self.tcx, substs);
let fn_sig =
- self.replace_bound_vars_with_fresh_vars(obligation.cause.span, infer::FnCall, fn_sig);
+ self.instantiate_binder_with_fresh_vars(obligation.cause.span, infer::FnCall, fn_sig);
let InferOk { value, obligations: o } =
self.at(&obligation.cause, self.param_env).normalize(fn_sig);
ty::AssocKind::Fn => self.probe(|_| {
let substs = self.fresh_substs_for_item(self.span, method.def_id);
let fty = self.tcx.fn_sig(method.def_id).subst(self.tcx, substs);
- let fty = self.replace_bound_vars_with_fresh_vars(self.span, infer::FnCall, fty);
+ let fty = self.instantiate_binder_with_fresh_vars(self.span, infer::FnCall, fty);
if let Some(self_ty) = self_ty {
if self
let a_types = infcx.tcx.anonymize_bound_vars(a_types);
let b_types = infcx.tcx.anonymize_bound_vars(b_types);
if a_types.bound_vars() == b_types.bound_vars() {
- let (a_types, b_types) = infcx.replace_bound_vars_with_placeholders(
+ let (a_types, b_types) = infcx.instantiate_binder_with_placeholders(
a_types.map_bound(|a_types| (a_types, b_types.skip_binder())),
);
for (a, b) in std::iter::zip(a_types, b_types) {
// First, we instantiate each bound region in the supertype with a
// fresh placeholder region. Note that this automatically creates
// a new universe if needed.
- let sup_prime = self.infcx.replace_bound_vars_with_placeholders(sup);
+ let sup_prime = self.infcx.instantiate_binder_with_placeholders(sup);
// Next, we instantiate each bound region in the subtype
// with a fresh region variable. These region variables --
// but no other pre-existing region variables -- can name
// the placeholders.
- let sub_prime = self.infcx.replace_bound_vars_with_fresh_vars(span, HigherRankedType, sub);
+ let sub_prime = self.infcx.instantiate_binder_with_fresh_vars(span, HigherRankedType, sub);
debug!("a_prime={:?}", sub_prime);
debug!("b_prime={:?}", sup_prime);
///
/// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/traits/hrtb.html
#[instrument(level = "debug", skip(self), ret)]
- pub fn replace_bound_vars_with_placeholders<T>(&self, binder: ty::Binder<'tcx, T>) -> T
+ pub fn instantiate_binder_with_placeholders<T>(&self, binder: ty::Binder<'tcx, T>) -> T
where
T: TypeFoldable<'tcx> + Copy,
{
Ok(self.commit_if_ok(|_snapshot| {
let ty::SubtypePredicate { a_is_expected, a, b } =
- self.replace_bound_vars_with_placeholders(predicate);
+ self.instantiate_binder_with_placeholders(predicate);
let ok = self.at(cause, param_env).sub_exp(a_is_expected, a, b)?;
cause: &traits::ObligationCause<'tcx>,
predicate: ty::PolyRegionOutlivesPredicate<'tcx>,
) {
- let ty::OutlivesPredicate(r_a, r_b) = self.replace_bound_vars_with_placeholders(predicate);
+ let ty::OutlivesPredicate(r_a, r_b) = self.instantiate_binder_with_placeholders(predicate);
let origin =
SubregionOrigin::from_obligation_cause(cause, || RelateRegionParamBound(cause.span));
self.sub_regions(origin, r_b, r_a); // `b : a` ==> `a <= b`
value
}
- pub fn replace_bound_vars_with_fresh_vars<T>(
+ // Instantiates the bound variables in a given binder with fresh inference
+ // variables in the current universe.
+ //
+ // Use this method if you'd like to find some substitution of the binder's
+ // variables (e.g. during a method call). If there isn't a [`LateBoundRegionConversionTime`]
+ // that corresponds to your use case, consider whether or not you should
+ // use [`InferCtxt::instantiate_binder_with_placeholders`] instead.
+ pub fn instantiate_binder_with_fresh_vars<T>(
&self,
span: Span,
lbrct: LateBoundRegionConversionTime,
let a_types = infcx.tcx.anonymize_bound_vars(a_types);
let b_types = infcx.tcx.anonymize_bound_vars(b_types);
if a_types.bound_vars() == b_types.bound_vars() {
- let (a_types, b_types) = infcx.replace_bound_vars_with_placeholders(
+ let (a_types, b_types) = infcx.instantiate_binder_with_placeholders(
a_types.map_bound(|a_types| (a_types, b_types.skip_binder())),
);
for (a, b) in std::iter::zip(a_types, b_types) {
)
}
ty::PredicateKind::Subtype(pred) => {
- let (a, b) = infcx.replace_bound_vars_with_placeholders(
+ let (a, b) = infcx.instantiate_binder_with_placeholders(
goal.predicate.kind().rebind((pred.a, pred.b)),
);
let expected_found = ExpectedFound::new(true, a, b);
)
}
ty::PredicateKind::Coerce(pred) => {
- let (a, b) = infcx.replace_bound_vars_with_placeholders(
+ let (a, b) = infcx.instantiate_binder_with_placeholders(
goal.predicate.kind().rebind((pred.a, pred.b)),
);
let expected_found = ExpectedFound::new(false, a, b);
)
}
ty::PredicateKind::ConstEquate(a, b) => {
- let (a, b) = infcx.replace_bound_vars_with_placeholders(
+ let (a, b) = infcx.instantiate_binder_with_placeholders(
goal.predicate.kind().rebind((a, b)),
);
let expected_found = ExpectedFound::new(true, a, b);
rhs: T,
) -> Result<Vec<Goal<'tcx, ty::Predicate<'tcx>>>, NoSolution>;
- fn instantiate_bound_vars_with_infer<T: TypeFoldable<'tcx> + Copy>(
+ fn instantiate_binder_with_infer<T: TypeFoldable<'tcx> + Copy>(
&self,
value: ty::Binder<'tcx, T>,
) -> T;
})
}
- fn instantiate_bound_vars_with_infer<T: TypeFoldable<'tcx> + Copy>(
+ fn instantiate_binder_with_infer<T: TypeFoldable<'tcx> + Copy>(
&self,
value: ty::Binder<'tcx, T>,
) -> T {
- self.replace_bound_vars_with_fresh_vars(
+ self.instantiate_binder_with_fresh_vars(
DUMMY_SP,
LateBoundRegionConversionTime::HigherRankedType,
value,
}
}
} else {
- let kind = self.infcx.replace_bound_vars_with_placeholders(kind);
+ let kind = self.infcx.instantiate_binder_with_placeholders(kind);
let goal = goal.with(self.tcx(), ty::Binder::dummy(kind));
let (_, certainty) = self.evaluate_goal(goal)?;
self.make_canonical_response(certainty)
{
ecx.infcx.probe(|_| {
let assumption_projection_pred =
- ecx.infcx.instantiate_bound_vars_with_infer(poly_projection_pred);
+ ecx.infcx.instantiate_binder_with_infer(poly_projection_pred);
let nested_goals = ecx.infcx.eq(
goal.param_env,
goal.predicate.projection_ty,
// FIXME: Constness and polarity
ecx.infcx.probe(|_| {
let assumption_trait_pred =
- ecx.infcx.instantiate_bound_vars_with_infer(poly_trait_pred);
+ ecx.infcx.instantiate_binder_with_infer(poly_trait_pred);
let nested_goals = ecx.infcx.eq(
goal.param_env,
goal.predicate.trait_ref,
}
ty::GeneratorWitness(types) => {
- Ok(infcx.replace_bound_vars_with_placeholders(types).to_vec())
+ Ok(infcx.instantiate_binder_with_placeholders(types).to_vec())
}
ty::GeneratorWitnessMIR(..) => todo!(),
}
ty::GeneratorWitness(types) => {
- Ok(infcx.replace_bound_vars_with_placeholders(types).to_vec())
+ Ok(infcx.instantiate_binder_with_placeholders(types).to_vec())
}
ty::GeneratorWitnessMIR(..) => todo!(),
let impl_may_apply = |impl_def_id| {
let ocx = ObligationCtxt::new_in_snapshot(infcx);
let placeholder_obligation =
- infcx.replace_bound_vars_with_placeholders(obligation.predicate);
+ infcx.instantiate_binder_with_placeholders(obligation.predicate);
let obligation_trait_ref =
ocx.normalize(&ObligationCause::dummy(), param_env, placeholder_obligation.trait_ref);
let param_env_candidate_may_apply = |poly_trait_predicate: ty::PolyTraitPredicate<'tcx>| {
let ocx = ObligationCtxt::new_in_snapshot(infcx);
let placeholder_obligation =
- infcx.replace_bound_vars_with_placeholders(obligation.predicate);
+ infcx.instantiate_binder_with_placeholders(obligation.predicate);
let obligation_trait_ref =
ocx.normalize(&ObligationCause::dummy(), param_env, placeholder_obligation.trait_ref);
- let param_env_predicate = infcx.replace_bound_vars_with_fresh_vars(
+ let param_env_predicate = infcx.instantiate_binder_with_fresh_vars(
DUMMY_SP,
LateBoundRegionConversionTime::HigherRankedType,
poly_trait_predicate,
let (values, err) = if let ty::PredicateKind::Clause(ty::Clause::Projection(data)) =
bound_predicate.skip_binder()
{
- let data = self.replace_bound_vars_with_fresh_vars(
+ let data = self.instantiate_binder_with_fresh_vars(
obligation.cause.span,
infer::LateBoundRegionConversionTime::HigherRankedType,
bound_predicate.rebind(data),
return false;
}
- let self_ty = self.replace_bound_vars_with_fresh_vars(
+ let self_ty = self.instantiate_binder_with_fresh_vars(
DUMMY_SP,
LateBoundRegionConversionTime::FnCall,
trait_pred.self_ty(),
}
}) else { return None; };
- let output = self.replace_bound_vars_with_fresh_vars(
+ let output = self.instantiate_binder_with_fresh_vars(
DUMMY_SP,
LateBoundRegionConversionTime::FnCall,
output,
.skip_binder()
.iter()
.map(|ty| {
- self.replace_bound_vars_with_fresh_vars(
+ self.instantiate_binder_with_fresh_vars(
DUMMY_SP,
LateBoundRegionConversionTime::FnCall,
inputs.rebind(*ty),
err: &mut Diagnostic,
) {
let found_args = match found.kind() {
- ty::FnPtr(f) => infcx.replace_bound_vars_with_placeholders(*f).inputs().iter(),
+ ty::FnPtr(f) => infcx.instantiate_binder_with_placeholders(*f).inputs().iter(),
kind => {
span_bug!(span, "found was converted to a FnPtr above but is now {:?}", kind)
}
};
let expected_args = match expected.kind() {
- ty::FnPtr(f) => infcx.replace_bound_vars_with_placeholders(*f).inputs().iter(),
+ ty::FnPtr(f) => infcx.instantiate_binder_with_placeholders(*f).inputs().iter(),
kind => {
span_bug!(span, "expected was converted to a FnPtr above but is now {:?}", kind)
}
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..) => {
let pred =
- ty::Binder::dummy(infcx.replace_bound_vars_with_placeholders(binder));
+ ty::Binder::dummy(infcx.instantiate_binder_with_placeholders(binder));
ProcessResult::Changed(mk_pending(vec![obligation.with(infcx.tcx, pred)]))
}
ty::PredicateKind::Ambiguous => ProcessResult::Unchanged,
let r = infcx.commit_if_ok(|_snapshot| {
let old_universe = infcx.universe();
let placeholder_predicate =
- infcx.replace_bound_vars_with_placeholders(obligation.predicate);
+ infcx.instantiate_binder_with_placeholders(obligation.predicate);
let new_universe = infcx.universe();
let placeholder_obligation = obligation.with(infcx.tcx, placeholder_predicate);
let cause = &obligation.cause;
let param_env = obligation.param_env;
- let cache_entry = infcx.replace_bound_vars_with_fresh_vars(
+ let cache_entry = infcx.instantiate_binder_with_fresh_vars(
cause.span,
LateBoundRegionConversionTime::HigherRankedType,
poly_cache_entry,
let poly_trait_predicate = self.infcx.resolve_vars_if_possible(obligation.predicate);
let placeholder_trait_predicate =
- self.infcx.replace_bound_vars_with_placeholders(poly_trait_predicate);
+ self.infcx.instantiate_binder_with_placeholders(poly_trait_predicate);
// Count only those upcast versions that match the trait-ref
// we are looking for. Specifically, do not only check for the
let trait_predicate = self.infcx.shallow_resolve(obligation.predicate);
let placeholder_trait_predicate =
- self.infcx.replace_bound_vars_with_placeholders(trait_predicate).trait_ref;
+ self.infcx.instantiate_binder_with_placeholders(trait_predicate).trait_ref;
let placeholder_self_ty = placeholder_trait_predicate.self_ty();
let placeholder_trait_predicate = ty::Binder::dummy(placeholder_trait_predicate);
let (def_id, substs) = match *placeholder_self_ty.kind() {
let cause = obligation.derived_cause(BuiltinDerivedObligation);
let poly_trait_ref = obligation.predicate.to_poly_trait_ref();
- let trait_ref = self.infcx.replace_bound_vars_with_placeholders(poly_trait_ref);
+ let trait_ref = self.infcx.instantiate_binder_with_placeholders(poly_trait_ref);
let trait_obligations: Vec<PredicateObligation<'_>> = self.impl_or_trait_obligations(
&cause,
obligation.recursion_depth + 1,
let tcx = self.tcx();
debug!(?obligation, ?index, "confirm_object_candidate");
- let trait_predicate = self.infcx.replace_bound_vars_with_placeholders(obligation.predicate);
+ let trait_predicate = self.infcx.instantiate_binder_with_placeholders(obligation.predicate);
let self_ty = self.infcx.shallow_resolve(trait_predicate.self_ty());
let obligation_trait_ref = ty::Binder::dummy(trait_predicate.trait_ref);
let ty::Dynamic(data, ..) = *self_ty.kind() else {
let object_trait_ref = data.principal().unwrap_or_else(|| {
span_bug!(obligation.cause.span, "object candidate with no principal")
});
- let object_trait_ref = self.infcx.replace_bound_vars_with_fresh_vars(
+ let object_trait_ref = self.infcx.instantiate_binder_with_fresh_vars(
obligation.cause.span,
HigherRankedType,
object_trait_ref,
}
// Confirm the `type Output: Sized;` bound that is present on `FnOnce`
- let output_ty = self.infcx.replace_bound_vars_with_placeholders(sig.output());
+ let output_ty = self.infcx.instantiate_binder_with_placeholders(sig.output());
let output_ty = normalize_with_depth_to(
self,
obligation.param_env,
debug!(?obligation, "confirm_trait_alias_candidate");
let alias_def_id = obligation.predicate.def_id();
- let predicate = self.infcx.replace_bound_vars_with_placeholders(obligation.predicate);
+ let predicate = self.infcx.instantiate_binder_with_placeholders(obligation.predicate);
let trait_ref = predicate.trait_ref;
let trait_def_id = trait_ref.def_id;
let substs = trait_ref.substs;
) -> smallvec::SmallVec<[(usize, ty::BoundConstness); 2]> {
let poly_trait_predicate = self.infcx.resolve_vars_if_possible(obligation.predicate);
let placeholder_trait_predicate =
- self.infcx.replace_bound_vars_with_placeholders(poly_trait_predicate);
+ self.infcx.instantiate_binder_with_placeholders(poly_trait_predicate);
debug!(?placeholder_trait_predicate);
let tcx = self.infcx.tcx;
potentially_unnormalized_candidates: bool,
) -> ProjectionMatchesProjection {
let mut nested_obligations = Vec::new();
- let infer_predicate = self.infcx.replace_bound_vars_with_fresh_vars(
+ let infer_predicate = self.infcx.instantiate_binder_with_fresh_vars(
obligation.cause.span,
LateBoundRegionConversionTime::HigherRankedType,
env_predicate,
.flat_map(|ty| {
let ty: ty::Binder<'tcx, Ty<'tcx>> = types.rebind(*ty); // <----/
- let placeholder_ty = self.infcx.replace_bound_vars_with_placeholders(ty);
+ let placeholder_ty = self.infcx.instantiate_binder_with_placeholders(ty);
let Normalized { value: normalized_ty, mut obligations } =
ensure_sufficient_stack(|| {
project::normalize_with_depth(
obligation: &TraitObligation<'tcx>,
) -> Result<Normalized<'tcx, SubstsRef<'tcx>>, ()> {
let placeholder_obligation =
- self.infcx.replace_bound_vars_with_placeholders(obligation.predicate);
+ self.infcx.instantiate_binder_with_placeholders(obligation.predicate);
let placeholder_obligation_trait_ref = placeholder_obligation.trait_ref;
let impl_substs = self.infcx.fresh_substs_for_item(obligation.cause.span, impl_def_id);
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