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Extract compute_bidirectional_outlives_predicates fn
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@ -2,7 +2,7 @@ use crate::astconv::{AstConv, OnlySelfBounds, PredicateFilter};
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use crate::bounds::Bounds;
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use crate::collect::ItemCtxt;
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use crate::constrained_generic_params as cgp;
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use hir::{HirId, Node};
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use hir::{HirId, Lifetime, Node};
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use rustc_data_structures::fx::FxIndexSet;
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use rustc_hir as hir;
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use rustc_hir::def::DefKind;
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@ -10,9 +10,9 @@ use rustc_hir::def_id::{DefId, LocalDefId};
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use rustc_hir::intravisit::{self, Visitor};
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use rustc_middle::ty::subst::InternalSubsts;
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use rustc_middle::ty::{self, Ty, TyCtxt};
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use rustc_middle::ty::{GenericPredicates, ToPredicate};
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use rustc_middle::ty::{GenericPredicates, Generics, ToPredicate};
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use rustc_span::symbol::{sym, Ident};
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use rustc_span::{Span, DUMMY_SP};
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use rustc_span::{Span, Symbol, DUMMY_SP};
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/// Returns a list of all type predicates (explicit and implicit) for the definition with
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/// ID `def_id`. This includes all predicates returned by `predicates_defined_on`, plus
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@ -289,38 +289,16 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
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bug!("unexpected {opaque_ty_node:?}")
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};
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debug!(?lifetimes);
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for (arg, duplicate) in std::iter::zip(lifetimes, ast_generics.params) {
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let hir::GenericArg::Lifetime(arg) = arg else { bug!() };
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let orig_region = icx.astconv().ast_region_to_region(&arg, None);
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if !matches!(orig_region.kind(), ty::ReEarlyBound(..)) {
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// Only early-bound regions can point to the original generic parameter.
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continue;
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}
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let hir::GenericParamKind::Lifetime { .. } = duplicate.kind else { continue };
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let dup_def = duplicate.def_id.to_def_id();
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let lifetime_mapping = std::iter::zip(lifetimes, ast_generics.params)
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.map(|(arg, dup)| {
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let hir::GenericArg::Lifetime(arg) = arg else { bug!() };
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(**arg, dup)
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})
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.filter(|(_, dup)| matches!(dup.kind, hir::GenericParamKind::Lifetime { .. }))
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.map(|(lifetime, dup)| (lifetime, (dup.def_id, dup.name.ident().name, dup.span)));
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let Some(dup_index) = generics.param_def_id_to_index(tcx, dup_def) else { bug!() };
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let dup_region = ty::Region::new_early_bound(
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tcx,
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ty::EarlyBoundRegion {
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def_id: dup_def,
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index: dup_index,
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name: duplicate.name.ident().name,
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},
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);
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predicates.push((
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ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(orig_region, dup_region))
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.to_predicate(icx.tcx),
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duplicate.span,
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));
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predicates.push((
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ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(dup_region, orig_region))
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.to_predicate(icx.tcx),
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duplicate.span,
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));
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}
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bidirectional_lifetime_predicates(tcx, def_id, lifetime_mapping, generics, &mut predicates);
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debug!(?predicates);
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}
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@ -330,6 +308,46 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
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}
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}
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/// Opaques have duplicated lifetimes and we need to compute bidirectional outlives predicates to
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/// enforce that these lifetimes stay in sync.
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fn compute_bidirectional_outlives_predicates<'tcx>(
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tcx: TyCtxt<'tcx>,
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item_def_id: LocalDefId,
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lifetime_mapping: impl Iterator<Item = (Lifetime, (LocalDefId, Symbol, Span))>,
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generics: &Generics,
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predicates: &mut Vec<(ty::Clause<'tcx>, Span)>,
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) {
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let icx = ItemCtxt::new(tcx, item_def_id);
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for (arg, (dup_def, name, span)) in lifetime_mapping {
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let orig_region = icx.astconv().ast_region_to_region(&arg, None);
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if !matches!(orig_region.kind(), ty::ReEarlyBound(..)) {
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// There is no late-bound lifetime to actually match up here, since the lifetime doesn't
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// show up in the opaque's parent's substs.
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continue;
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}
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let Some(dup_index) = generics.param_def_id_to_index(icx.tcx, dup_def.to_def_id()) else { bug!() };
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let dup_region = ty::Region::new_early_bound(
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tcx,
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ty::EarlyBoundRegion { def_id: dup_def.to_def_id(), index: dup_index, name },
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);
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predicates.push((
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ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(orig_region, dup_region))
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.to_predicate(tcx),
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span,
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));
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predicates.push((
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ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(dup_region, orig_region))
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.to_predicate(tcx),
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span,
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));
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}
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}
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fn const_evaluatable_predicates_of(
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tcx: TyCtxt<'_>,
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def_id: LocalDefId,
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