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Migrate predicates_of and caller_bounds to Clause

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This commit is contained in:
Michael Goulet 2023-06-22 18:17:13 +00:00
parent 36fb58e433
commit fbdef58414
77 changed files with 478 additions and 705 deletions
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59
compiler/rustc_hir_analysis/src/astconv/mod.rs
View file

@ -945,40 +945,29 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
let mut trait_bounds = vec![];
let mut projection_bounds = vec![];
for (clause, span) in bounds.clauses() {
let pred: ty::Predicate<'tcx> = clause.as_predicate();
for (pred, span) in bounds.clauses() {
let bound_pred = pred.kind();
match bound_pred.skip_binder() {
ty::PredicateKind::Clause(clause) => match clause {
ty::ClauseKind::Trait(trait_pred) => {
assert_eq!(trait_pred.polarity, ty::ImplPolarity::Positive);
trait_bounds.push((
bound_pred.rebind(trait_pred.trait_ref),
span,
trait_pred.constness,
));
}
ty::ClauseKind::Projection(proj) => {
projection_bounds.push((bound_pred.rebind(proj), span));
}
ty::ClauseKind::TypeOutlives(_) => {
// Do nothing, we deal with regions separately
}
ty::ClauseKind::RegionOutlives(_)
| ty::ClauseKind::ConstArgHasType(..)
| ty::ClauseKind::WellFormed(_)
| ty::ClauseKind::ConstEvaluatable(_) => {
bug!()
}
},
ty::PredicateKind::AliasRelate(..)
| ty::PredicateKind::ObjectSafe(_)
| ty::PredicateKind::ClosureKind(_, _, _)
| ty::PredicateKind::Subtype(_)
| ty::PredicateKind::Coerce(_)
| ty::PredicateKind::ConstEquate(_, _)
| ty::PredicateKind::TypeWellFormedFromEnv(_)
| ty::PredicateKind::Ambiguous => bug!(),
ty::ClauseKind::Trait(trait_pred) => {
assert_eq!(trait_pred.polarity, ty::ImplPolarity::Positive);
trait_bounds.push((
bound_pred.rebind(trait_pred.trait_ref),
span,
trait_pred.constness,
));
}
ty::ClauseKind::Projection(proj) => {
projection_bounds.push((bound_pred.rebind(proj), span));
}
ty::ClauseKind::TypeOutlives(_) => {
// Do nothing, we deal with regions separately
}
ty::ClauseKind::RegionOutlives(_)
| ty::ClauseKind::ConstArgHasType(..)
| ty::ClauseKind::WellFormed(_)
| ty::ClauseKind::ConstEvaluatable(_) => {
bug!()
}
}
}
@ -1425,9 +1414,9 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
|| {
traits::transitive_bounds_that_define_assoc_item(
tcx,
predicates.iter().filter_map(|(p, _)| {
Some(p.to_opt_poly_trait_pred()?.map_bound(|t| t.trait_ref))
}),
predicates
.iter()
.filter_map(|(p, _)| Some(p.as_trait_clause()?.map_bound(|t| t.trait_ref))),
assoc_name,
)
},

6
compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
View file

@ -220,7 +220,7 @@ fn compare_method_predicate_entailment<'tcx>(
// the new hybrid bounds we computed.
let normalize_cause = traits::ObligationCause::misc(impl_m_span, impl_m_def_id);
let param_env = ty::ParamEnv::new(
tcx.mk_predicates(&hybrid_preds.predicates),
tcx.mk_clauses(&hybrid_preds.predicates),
Reveal::UserFacing,
hir::Constness::NotConst,
);
@ -1835,7 +1835,7 @@ fn compare_type_predicate_entailment<'tcx>(
let impl_ty_span = tcx.def_span(impl_ty_def_id);
let normalize_cause = traits::ObligationCause::misc(impl_ty_span, impl_ty_def_id);
let param_env = ty::ParamEnv::new(
tcx.mk_predicates(&hybrid_preds.predicates),
tcx.mk_clauses(&hybrid_preds.predicates),
Reveal::UserFacing,
hir::Constness::NotConst,
);
@ -2011,7 +2011,7 @@ pub(super) fn check_type_bounds<'tcx>(
.to_predicate(tcx),
),
};
ty::ParamEnv::new(tcx.mk_predicates(&predicates), Reveal::UserFacing, param_env.constness())
ty::ParamEnv::new(tcx.mk_clauses(&predicates), Reveal::UserFacing, param_env.constness())
};
debug!(?normalize_param_env);

8
compiler/rustc_hir_analysis/src/check/mod.rs
View file

@ -296,7 +296,7 @@ fn default_body_is_unstable(
/// Re-sugar `ty::GenericPredicates` in a way suitable to be used in structured suggestions.
fn bounds_from_generic_predicates<'tcx>(
tcx: TyCtxt<'tcx>,
predicates: impl IntoIterator<Item = (ty::Predicate<'tcx>, Span)>,
predicates: impl IntoIterator<Item = (ty::Clause<'tcx>, Span)>,
) -> (String, String) {
let mut types: FxHashMap<Ty<'tcx>, Vec<DefId>> = FxHashMap::default();
let mut projections = vec![];
@ -304,7 +304,7 @@ fn bounds_from_generic_predicates<'tcx>(
debug!("predicate {:?}", predicate);
let bound_predicate = predicate.kind();
match bound_predicate.skip_binder() {
ty::PredicateKind::Clause(ty::ClauseKind::Trait(trait_predicate)) => {
ty::ClauseKind::Trait(trait_predicate) => {
let entry = types.entry(trait_predicate.self_ty()).or_default();
let def_id = trait_predicate.def_id();
if Some(def_id) != tcx.lang_items().sized_trait() {
@ -313,7 +313,7 @@ fn bounds_from_generic_predicates<'tcx>(
entry.push(trait_predicate.def_id());
}
}
ty::PredicateKind::Clause(ty::ClauseKind::Projection(projection_pred)) => {
ty::ClauseKind::Projection(projection_pred) => {
projections.push(bound_predicate.rebind(projection_pred));
}
_ => {}
@ -362,7 +362,7 @@ fn fn_sig_suggestion<'tcx>(
tcx: TyCtxt<'tcx>,
sig: ty::FnSig<'tcx>,
ident: Ident,
predicates: impl IntoIterator<Item = (ty::Predicate<'tcx>, Span)>,
predicates: impl IntoIterator<Item = (ty::Clause<'tcx>, Span)>,
assoc: ty::AssocItem,
) -> String {
let args = sig

64
compiler/rustc_hir_analysis/src/check/wfcheck.rs
View file

@ -15,7 +15,7 @@ use rustc_middle::mir::ConstraintCategory;
use rustc_middle::query::Providers;
use rustc_middle::ty::trait_def::TraitSpecializationKind;
use rustc_middle::ty::{
self, AdtKind, GenericParamDefKind, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable,
self, AdtKind, GenericParamDefKind, ToPredicate, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable,
TypeVisitable, TypeVisitableExt, TypeVisitor,
};
use rustc_middle::ty::{GenericArgKind, InternalSubsts};
@ -322,7 +322,7 @@ fn check_gat_where_clauses(tcx: TyCtxt<'_>, associated_items: &[hir::TraitItemRe
// Gather the bounds with which all other items inside of this trait constrain the GAT.
// This is calculated by taking the intersection of the bounds that each item
// constrains the GAT with individually.
let mut new_required_bounds: Option<FxHashSet<ty::Predicate<'_>>> = None;
let mut new_required_bounds: Option<FxHashSet<ty::Clause<'_>>> = None;
for item in associated_items {
let item_def_id = item.id.owner_id;
// Skip our own GAT, since it does not constrain itself at all.
@ -419,9 +419,17 @@ fn check_gat_where_clauses(tcx: TyCtxt<'_>, associated_items: &[hir::TraitItemRe
let mut unsatisfied_bounds: Vec<_> = required_bounds
.into_iter()
.filter(|clause| match clause.kind().skip_binder() {
ty::PredicateKind::Clause(ty::ClauseKind::RegionOutlives(
ty::OutlivesPredicate(a, b),
)) => !region_known_to_outlive(
ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(a, b)) => {
!region_known_to_outlive(
tcx,
gat_def_id.def_id,
param_env,
&FxIndexSet::default(),
a,
b,
)
}
ty::ClauseKind::TypeOutlives(ty::OutlivesPredicate(a, b)) => !ty_known_to_outlive(
tcx,
gat_def_id.def_id,
param_env,
@ -429,18 +437,7 @@ fn check_gat_where_clauses(tcx: TyCtxt<'_>, associated_items: &[hir::TraitItemRe
a,
b,
),
ty::PredicateKind::Clause(ty::ClauseKind::TypeOutlives(ty::OutlivesPredicate(
a,
b,
))) => !ty_known_to_outlive(
tcx,
gat_def_id.def_id,
param_env,
&FxIndexSet::default(),
a,
b,
),
_ => bug!("Unexpected PredicateKind"),
_ => bug!("Unexpected ClauseKind"),
})
.map(|clause| clause.to_string())
.collect();
@ -488,7 +485,7 @@ fn check_gat_where_clauses(tcx: TyCtxt<'_>, associated_items: &[hir::TraitItemRe
fn augment_param_env<'tcx>(
tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
new_predicates: Option<&FxHashSet<ty::Predicate<'tcx>>>,
new_predicates: Option<&FxHashSet<ty::Clause<'tcx>>>,
) -> ty::ParamEnv<'tcx> {
let Some(new_predicates) = new_predicates else {
return param_env;
@ -498,7 +495,7 @@ fn augment_param_env<'tcx>(
return param_env;
}
let bounds = tcx.mk_predicates_from_iter(
let bounds = tcx.mk_clauses_from_iter(
param_env.caller_bounds().iter().chain(new_predicates.iter().cloned()),
);
// FIXME(compiler-errors): Perhaps there is a case where we need to normalize this
@ -524,7 +521,7 @@ fn gather_gat_bounds<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
wf_tys: &FxIndexSet<Ty<'tcx>>,
gat_def_id: LocalDefId,
gat_generics: &'tcx ty::Generics,
) -> Option<FxHashSet<ty::Predicate<'tcx>>> {
) -> Option<FxHashSet<ty::Clause<'tcx>>> {
// The bounds we that we would require from `to_check`
let mut bounds = FxHashSet::default();
@ -573,11 +570,10 @@ fn gather_gat_bounds<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
);
// The predicate we expect to see. (In our example,
// `Self: 'me`.)
let clause = ty::PredicateKind::Clause(ty::ClauseKind::TypeOutlives(
ty::OutlivesPredicate(ty_param, region_param),
));
let clause = tcx.mk_predicate(ty::Binder::dummy(clause));
bounds.insert(clause);
bounds.insert(
ty::ClauseKind::TypeOutlives(ty::OutlivesPredicate(ty_param, region_param))
.to_predicate(tcx),
);
}
}
@ -622,11 +618,13 @@ fn gather_gat_bounds<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
},
);
// The predicate we expect to see.
let clause = ty::PredicateKind::Clause(ty::ClauseKind::RegionOutlives(
ty::OutlivesPredicate(region_a_param, region_b_param),
));
let clause = tcx.mk_predicate(ty::Binder::dummy(clause));
bounds.insert(clause);
bounds.insert(
ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(
region_a_param,
region_b_param,
))
.to_predicate(tcx),
);
}
}
}
@ -1406,7 +1404,7 @@ fn check_where_clauses<'tcx>(wfcx: &WfCheckingCtxt<'_, 'tcx>, span: Span, def_id
infcx,
wfcx.param_env.without_const(),
wfcx.body_def_id,
p,
p.as_predicate(),
sp,
)
});
@ -1875,9 +1873,7 @@ impl<'tcx> WfCheckingCtxt<'_, 'tcx> {
// We lower empty bounds like `Vec<dyn Copy>:` as
// `WellFormed(Vec<dyn Copy>)`, which will later get checked by
// regular WF checking
if let ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(..)) =
pred.kind().skip_binder()
{
if let ty::ClauseKind::WellFormed(..) = pred.kind().skip_binder() {
continue;
}
// Match the existing behavior.

12
compiler/rustc_hir_analysis/src/collect/item_bounds.rs
View file

@ -38,16 +38,12 @@ fn associated_type_bounds<'tcx>(
.iter()
.copied()
.filter(|(pred, _)| match pred.kind().skip_binder() {
ty::PredicateKind::Clause(ty::ClauseKind::Trait(tr)) => tr.self_ty() == item_ty,
ty::PredicateKind::Clause(ty::ClauseKind::Projection(proj)) => {
proj.projection_ty.self_ty() == item_ty
}
ty::PredicateKind::Clause(ty::ClauseKind::TypeOutlives(outlives)) => {
outlives.0 == item_ty
}
ty::ClauseKind::Trait(tr) => tr.self_ty() == item_ty,
ty::ClauseKind::Projection(proj) => proj.projection_ty.self_ty() == item_ty,
ty::ClauseKind::TypeOutlives(outlives) => outlives.0 == item_ty,
_ => false,
})
.map(|(pred, span)| (pred.expect_clause(), span));
.map(|(clause, span)| (clause, span));
let all_bounds = tcx.arena.alloc_from_iter(bounds.clauses().chain(bounds_from_parent));
debug!(

88
compiler/rustc_hir_analysis/src/collect/predicates_of.rs
View file

@ -75,7 +75,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
// We use an `IndexSet` to preserve order of insertion.
// Preserving the order of insertion is important here so as not to break UI tests.
let mut predicates: FxIndexSet<(ty::Predicate<'_>, Span)> = FxIndexSet::default();
let mut predicates: FxIndexSet<(ty::Clause<'_>, Span)> = FxIndexSet::default();
let ast_generics = match node {
Node::TraitItem(item) => item.generics,
@ -126,8 +126,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
predicates.extend(
icx.astconv()
.compute_bounds(tcx.types.self_param, self_bounds, OnlySelfBounds(false))
.clauses()
.map(|(clause, span)| (clause.as_predicate(), span)),
.clauses(),
);
}
@ -176,8 +175,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
param.span,
);
trace!(?bounds);
predicates
.extend(bounds.clauses().map(|(clause, span)| (clause.as_predicate(), span)));
predicates.extend(bounds.clauses());
trace!(?predicates);
}
GenericParamKind::Const { .. } => {
@ -188,11 +186,10 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
let ct = tcx.mk_const(param_const, ct_ty);
let predicate = ty::Binder::dummy(ty::PredicateKind::Clause(
ty::ClauseKind::ConstArgHasType(ct, ct_ty),
))
.to_predicate(tcx);
predicates.insert((predicate, param.span));
predicates.insert((
ty::ClauseKind::ConstArgHasType(ct, ct_ty).to_predicate(tcx),
param.span,
));
index += 1;
}
@ -221,7 +218,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
} else {
let span = bound_pred.bounded_ty.span;
let predicate = ty::Binder::bind_with_vars(
ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(ty.into())),
ty::ClauseKind::WellFormed(ty.into()),
bound_vars,
);
predicates.insert((predicate.to_predicate(tcx), span));
@ -236,8 +233,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
bound_vars,
OnlySelfBounds(false),
);
predicates
.extend(bounds.clauses().map(|(clause, span)| (clause.as_predicate(), span)));
predicates.extend(bounds.clauses());
}
hir::WherePredicate::RegionPredicate(region_pred) => {
@ -249,11 +245,8 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
}
_ => bug!(),
};
let pred = ty::Binder::dummy(ty::PredicateKind::Clause(
ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(r1, r2)),
))
.to_predicate(icx.tcx);
let pred = ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(r1, r2))
.to_predicate(icx.tcx);
(pred, span)
}))
}
@ -318,17 +311,13 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
},
);
predicates.push((
ty::Binder::dummy(ty::PredicateKind::Clause(ty::ClauseKind::RegionOutlives(
ty::OutlivesPredicate(orig_region, dup_region),
)))
.to_predicate(icx.tcx),
ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(orig_region, dup_region))
.to_predicate(icx.tcx),
duplicate.span,
));
predicates.push((
ty::Binder::dummy(ty::PredicateKind::Clause(ty::ClauseKind::RegionOutlives(
ty::OutlivesPredicate(dup_region, orig_region),
)))
.to_predicate(icx.tcx),
ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(dup_region, orig_region))
.to_predicate(icx.tcx),
duplicate.span,
));
}
@ -344,10 +333,10 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
fn const_evaluatable_predicates_of(
tcx: TyCtxt<'_>,
def_id: LocalDefId,
) -> FxIndexSet<(ty::Predicate<'_>, Span)> {
) -> FxIndexSet<(ty::Clause<'_>, Span)> {
struct ConstCollector<'tcx> {
tcx: TyCtxt<'tcx>,
preds: FxIndexSet<(ty::Predicate<'tcx>, Span)>,
preds: FxIndexSet<(ty::Clause<'tcx>, Span)>,
}
impl<'tcx> intravisit::Visitor<'tcx> for ConstCollector<'tcx> {
@ -355,13 +344,8 @@ fn const_evaluatable_predicates_of(
let ct = ty::Const::from_anon_const(self.tcx, c.def_id);
if let ty::ConstKind::Unevaluated(_) = ct.kind() {
let span = self.tcx.def_span(c.def_id);
self.preds.insert((
ty::Binder::dummy(ty::PredicateKind::Clause(ty::ClauseKind::ConstEvaluatable(
ct,
)))
.to_predicate(self.tcx),
span,
));
self.preds
.insert((ty::ClauseKind::ConstEvaluatable(ct).to_predicate(self.tcx), span));
}
}
@ -449,15 +433,9 @@ pub(super) fn explicit_predicates_of<'tcx>(
.iter()
.copied()
.filter(|(pred, _)| match pred.kind().skip_binder() {
ty::PredicateKind::Clause(ty::ClauseKind::Trait(tr)) => {
!is_assoc_item_ty(tr.self_ty())
}
ty::PredicateKind::Clause(ty::ClauseKind::Projection(proj)) => {
!is_assoc_item_ty(proj.projection_ty.self_ty())
}
ty::PredicateKind::Clause(ty::ClauseKind::TypeOutlives(outlives)) => {
!is_assoc_item_ty(outlives.0)
}
ty::ClauseKind::Trait(tr) => !is_assoc_item_ty(tr.self_ty()),
ty::ClauseKind::Projection(proj) => !is_assoc_item_ty(proj.projection_ty.self_ty()),
ty::ClauseKind::TypeOutlives(outlives) => !is_assoc_item_ty(outlives.0),
_ => true,
})
.collect();
@ -498,9 +476,7 @@ pub(super) fn explicit_predicates_of<'tcx>(
.predicates
.into_iter()
.filter(|(pred, _)| {
if let ty::PredicateKind::Clause(ty::ClauseKind::ConstArgHasType(ct, _)) =
pred.kind().skip_binder()
{
if let ty::ClauseKind::ConstArgHasType(ct, _) = pred.kind().skip_binder() {
match ct.kind() {
ty::ConstKind::Param(param_const) => {
let defaulted_param_idx = tcx
@ -665,12 +641,8 @@ pub(super) fn implied_predicates_with_filter(
};
// Combine the two lists to form the complete set of superbounds:
let implied_bounds = &*tcx.arena.alloc_from_iter(
superbounds
.clauses()
.map(|(clause, span)| (clause.as_predicate(), span))
.chain(where_bounds_that_match),
);
let implied_bounds =
&*tcx.arena.alloc_from_iter(superbounds.clauses().chain(where_bounds_that_match));
debug!(?implied_bounds);
// Now require that immediate supertraits are converted, which will, in
@ -679,7 +651,7 @@ pub(super) fn implied_predicates_with_filter(
if matches!(filter, PredicateFilter::SelfOnly) {
for &(pred, span) in implied_bounds {
debug!("superbound: {:?}", pred);
if let ty::PredicateKind::Clause(ty::ClauseKind::Trait(bound)) = pred.kind().skip_binder()
if let ty::ClauseKind::Trait(bound) = pred.kind().skip_binder()
&& bound.polarity == ty::ImplPolarity::Positive
{
tcx.at(span).super_predicates_of(bound.def_id());
@ -776,9 +748,7 @@ pub(super) fn type_param_predicates(
)
.into_iter()
.filter(|(predicate, _)| match predicate.kind().skip_binder() {
ty::PredicateKind::Clause(ty::ClauseKind::Trait(data)) => {
data.self_ty().is_param(index)
}
ty::ClauseKind::Trait(data) => data.self_ty().is_param(index),
_ => false,
}),
);
@ -800,7 +770,7 @@ impl<'tcx> ItemCtxt<'tcx> {
ty: Ty<'tcx>,
only_self_bounds: OnlySelfBounds,
assoc_name: Option<Ident>,
) -> Vec<(ty::Predicate<'tcx>, Span)> {
) -> Vec<(ty::Clause<'tcx>, Span)> {
let mut bounds = Bounds::default();
for predicate in ast_generics.predicates {
@ -829,7 +799,7 @@ impl<'tcx> ItemCtxt<'tcx> {
);
}
bounds.clauses().map(|(clause, span)| (clause.as_predicate(), span)).collect()
bounds.clauses().collect()
}
#[instrument(level = "trace", skip(self))]

2
compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
View file

@ -1761,7 +1761,7 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
let obligations = predicates.predicates.iter().filter_map(|&(pred, _)| {
let bound_predicate = pred.kind();
match bound_predicate.skip_binder() {
ty::PredicateKind::Clause(ty::ClauseKind::Trait(data)) => {
ty::ClauseKind::Trait(data) => {
// The order here needs to match what we would get from `subst_supertrait`
let pred_bound_vars = bound_predicate.bound_vars();
let mut all_bound_vars = bound_vars.clone();

6
compiler/rustc_hir_analysis/src/constrained_generic_params.rs
View file

@ -151,7 +151,7 @@ pub fn identify_constrained_generic_params<'tcx>(
/// think of any.
pub fn setup_constraining_predicates<'tcx>(
tcx: TyCtxt<'tcx>,
predicates: &mut [(ty::Predicate<'tcx>, Span)],
predicates: &mut [(ty::Clause<'tcx>, Span)],
impl_trait_ref: Option<ty::TraitRef<'tcx>>,
input_parameters: &mut FxHashSet<Parameter>,
) {
@ -187,9 +187,7 @@ pub fn setup_constraining_predicates<'tcx>(
for j in i..predicates.len() {
// Note that we don't have to care about binders here,
// as the impl trait ref never contains any late-bound regions.
if let ty::PredicateKind::Clause(ty::ClauseKind::Projection(projection)) =
predicates[j].0.kind().skip_binder()
{
if let ty::ClauseKind::Projection(projection) = predicates[j].0.kind().skip_binder() {
// Special case: watch out for some kind of sneaky attempt
// to project out an associated type defined by this very
// trait.

32
compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
View file

@ -235,10 +235,8 @@ fn unconstrained_parent_impl_substs<'tcx>(
// what we want here. We want only a list of constrained parameters while
// the functions in `cgp` add the constrained parameters to a list of
// unconstrained parameters.
for (predicate, _) in impl_generic_predicates.predicates.iter() {
if let ty::PredicateKind::Clause(ty::ClauseKind::Projection(proj)) =
predicate.kind().skip_binder()
{
for (clause, _) in impl_generic_predicates.predicates.iter() {
if let ty::ClauseKind::Projection(proj) = clause.kind().skip_binder() {
let projection_ty = proj.projection_ty;
let projected_ty = proj.term;
@ -340,8 +338,11 @@ fn check_predicates<'tcx>(
impl2_substs: SubstsRef<'tcx>,
span: Span,
) {
let instantiated = tcx.predicates_of(impl1_def_id).instantiate(tcx, impl1_substs);
let impl1_predicates: Vec<_> = traits::elaborate(tcx, instantiated.into_iter()).collect();
let impl1_predicates: Vec<_> = traits::elaborate(
tcx,
tcx.predicates_of(impl1_def_id).instantiate(tcx, impl1_substs).into_iter(),
)
.collect();
let mut impl2_predicates = if impl2_node.is_from_trait() {
// Always applicable traits have to be always applicable without any
@ -352,8 +353,8 @@ fn check_predicates<'tcx>(
tcx,
tcx.predicates_of(impl2_node.def_id())
.instantiate(tcx, impl2_substs)
.predicates
.into_iter(),
.into_iter()
.map(|(c, _s)| c.as_predicate()),
)
.collect()
};
@ -377,13 +378,13 @@ fn check_predicates<'tcx>(
let always_applicable_traits = impl1_predicates
.iter()
.copied()
.filter(|&(predicate, _)| {
.filter(|(clause, _span)| {
matches!(
trait_predicate_kind(tcx, predicate),
trait_predicate_kind(tcx, clause.as_predicate()),
Some(TraitSpecializationKind::AlwaysApplicable)
)
})
.map(|(pred, _span)| pred);
.map(|(c, _span)| c.as_predicate());
// Include the well-formed predicates of the type parameters of the impl.
for arg in tcx.impl_trait_ref(impl1_def_id).unwrap().subst_identity().substs {
@ -398,9 +399,12 @@ fn check_predicates<'tcx>(
}
impl2_predicates.extend(traits::elaborate(tcx, always_applicable_traits));
for (predicate, span) in impl1_predicates {
if !impl2_predicates.iter().any(|pred2| trait_predicates_eq(tcx, predicate, *pred2, span)) {
check_specialization_on(tcx, predicate, span)
for (clause, span) in impl1_predicates {
if !impl2_predicates
.iter()
.any(|pred2| trait_predicates_eq(tcx, clause.as_predicate(), *pred2, span))
{
check_specialization_on(tcx, clause.as_predicate(), span)
}
}
}

56
compiler/rustc_hir_analysis/src/outlives/explicit.rs
View file

@ -30,40 +30,30 @@ impl<'tcx> ExplicitPredicatesMap<'tcx> {
// process predicates and convert to `RequiredPredicates` entry, see below
for &(predicate, span) in predicates.predicates {
match predicate.kind().skip_binder() {
ty::PredicateKind::Clause(ty::ClauseKind::TypeOutlives(OutlivesPredicate(
ty,
reg,
))) => insert_outlives_predicate(
tcx,
ty.into(),
reg,
span,
&mut required_predicates,
),
ty::ClauseKind::TypeOutlives(OutlivesPredicate(ty, reg)) => {
insert_outlives_predicate(
tcx,
ty.into(),
reg,
span,
&mut required_predicates,
)
}
ty::PredicateKind::Clause(ty::ClauseKind::RegionOutlives(
OutlivesPredicate(reg1, reg2),
)) => insert_outlives_predicate(
tcx,
reg1.into(),
reg2,
span,
&mut required_predicates,
),
ty::PredicateKind::Clause(ty::ClauseKind::Trait(..))
| ty::PredicateKind::Clause(ty::ClauseKind::Projection(..))
| ty::PredicateKind::Clause(ty::ClauseKind::ConstArgHasType(..))
| ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(..))
| ty::PredicateKind::AliasRelate(..)
| ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::ClosureKind(..)
| ty::PredicateKind::Subtype(..)
| ty::PredicateKind::Coerce(..)
| ty::PredicateKind::Clause(ty::ClauseKind::ConstEvaluatable(..))
| ty::PredicateKind::ConstEquate(..)
| ty::PredicateKind::Ambiguous
| ty::PredicateKind::TypeWellFormedFromEnv(..) => (),
ty::ClauseKind::RegionOutlives(OutlivesPredicate(reg1, reg2)) => {
insert_outlives_predicate(
tcx,
reg1.into(),
reg2,
span,
&mut required_predicates,
)
}
ty::ClauseKind::Trait(_)
| ty::ClauseKind::Projection(_)
| ty::ClauseKind::ConstArgHasType(_, _)
| ty::ClauseKind::WellFormed(_)
| ty::ClauseKind::ConstEvaluatable(_) => {}
}
}