Add overlapping_assoc_constraints param to lower_bounds

Author: Jules-Bertholet

compiler/rustc_hir_analysis/src/collect/item_bounds.rs

@@ -12,7 +12,7 @@ use tracing::{debug, instrument};
 
 use super::ItemCtxt;
 use super::predicates_of::assert_only_contains_predicates_from;
-use crate::hir_ty_lowering::{HirTyLowerer, PredicateFilter};
+use crate::hir_ty_lowering::{HirTyLowerer, OverlappingAsssocItemConstraints, PredicateFilter};
 
 /// For associated types we include both bounds written on the type
 /// (`type X: Trait`) and predicates from the trait: `where Self::X: Trait`.
@@ -37,7 +37,14 @@ fn associated_type_bounds<'tcx>(
 
         let icx = ItemCtxt::new(tcx, assoc_item_def_id);
         let mut bounds = Vec::new();
-        icx.lowerer().lower_bounds(item_ty, hir_bounds, &mut bounds, ty::List::empty(), filter);
+        icx.lowerer().lower_bounds(
+            item_ty,
+            hir_bounds,
+            &mut bounds,
+            ty::List::empty(),
+            filter,
+            OverlappingAsssocItemConstraints::Allowed,
+        );
 
         match filter {
             PredicateFilter::All
@@ -347,7 +354,14 @@ fn opaque_type_bounds<'tcx>(
     ty::print::with_reduced_queries!({
         let icx = ItemCtxt::new(tcx, opaque_def_id);
         let mut bounds = Vec::new();
-        icx.lowerer().lower_bounds(item_ty, hir_bounds, &mut bounds, ty::List::empty(), filter);
+        icx.lowerer().lower_bounds(
+            item_ty,
+            hir_bounds,
+            &mut bounds,
+            ty::List::empty(),
+            filter,
+            OverlappingAsssocItemConstraints::Allowed,
+        );
         // Implicit bounds are added to opaque types unless a `?Trait` bound is found
         match filter {
             PredicateFilter::All

compiler/rustc_hir_analysis/src/collect/predicates_of.rs

@@ -18,7 +18,9 @@ use super::item_bounds::explicit_item_bounds_with_filter;
 use crate::collect::ItemCtxt;
 use crate::constrained_generic_params as cgp;
 use crate::delegation::inherit_predicates_for_delegation_item;
-use crate::hir_ty_lowering::{HirTyLowerer, PredicateFilter, RegionInferReason};
+use crate::hir_ty_lowering::{
+    HirTyLowerer, OverlappingAsssocItemConstraints, PredicateFilter, RegionInferReason,
+};
 
 /// Returns a list of all type predicates (explicit and implicit) for the definition with
 /// ID `def_id`. This includes all predicates returned by `explicit_predicates_of`, plus
@@ -187,6 +189,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
             &mut bounds,
             ty::List::empty(),
             PredicateFilter::All,
+            OverlappingAsssocItemConstraints::Allowed,
         );
         icx.lowerer().add_sizedness_bounds(
             &mut bounds,
@@ -289,6 +292,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
                     &mut bounds,
                     bound_vars,
                     PredicateFilter::All,
+                    OverlappingAsssocItemConstraints::Allowed,
                 );
                 predicates.extend(bounds);
             }
@@ -659,7 +663,14 @@ pub(super) fn implied_predicates_with_filter<'tcx>(
 
     let self_param_ty = tcx.types.self_param;
     let mut bounds = Vec::new();
-    icx.lowerer().lower_bounds(self_param_ty, superbounds, &mut bounds, ty::List::empty(), filter);
+    icx.lowerer().lower_bounds(
+        self_param_ty,
+        superbounds,
+        &mut bounds,
+        ty::List::empty(),
+        filter,
+        OverlappingAsssocItemConstraints::Allowed,
+    );
     match filter {
         PredicateFilter::All
         | PredicateFilter::SelfOnly
@@ -984,6 +995,7 @@ impl<'tcx> ItemCtxt<'tcx> {
                 &mut bounds,
                 bound_vars,
                 filter,
+                OverlappingAsssocItemConstraints::Allowed,
             );
         }
 
@@ -1063,6 +1075,7 @@ pub(super) fn const_conditions<'tcx>(
                     &mut bounds,
                     bound_vars,
                     PredicateFilter::ConstIfConst,
+                    OverlappingAsssocItemConstraints::Allowed,
                 );
             }
             _ => {}
@@ -1083,6 +1096,7 @@ pub(super) fn const_conditions<'tcx>(
             &mut bounds,
             ty::List::empty(),
             PredicateFilter::ConstIfConst,
+            OverlappingAsssocItemConstraints::Allowed,
         );
     }
 

compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs

@@ -339,6 +339,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         bounds: &mut Vec<(ty::Clause<'tcx>, Span)>,
         bound_vars: &'tcx ty::List<ty::BoundVariableKind>,
         predicate_filter: PredicateFilter,
+        overlapping_assoc_constraints: OverlappingAsssocItemConstraints,
     ) where
         'tcx: 'hir,
     {
@@ -363,7 +364,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                         param_ty,
                         bounds,
                         predicate_filter,
-                        OverlappingAsssocItemConstraints::Allowed,
+                        overlapping_assoc_constraints,
                     );
                 }
                 hir::GenericBound::Outlives(lifetime) => {
@@ -604,6 +605,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                             bounds,
                             projection_ty.bound_vars(),
                             predicate_filter,
+                            OverlappingAsssocItemConstraints::Allowed,
                         );
                     }
                     PredicateFilter::SelfOnly

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

@@ -2497,6 +2497,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                     &mut bounds,
                     ty::List::empty(),
                     PredicateFilter::All,
+                    OverlappingAsssocItemConstraints::Allowed,
                 );
                 self.add_sizedness_bounds(
                     &mut bounds,