Allow Trait inheritance with cycles on associated types

compiler/rustc_infer/src/traits/util.rs

@@ -1,9 +1,10 @@
 use smallvec::smallvec;
 
 use crate::traits::{Obligation, ObligationCause, PredicateObligation};
-use rustc_data_structures::fx::FxHashSet;
+use rustc_data_structures::fx::{FxHashSet, FxIndexSet};
 use rustc_middle::ty::outlives::Component;
 use rustc_middle::ty::{self, ToPredicate, TyCtxt, WithConstness};
+use rustc_span::symbol::Ident;
 
 pub fn anonymize_predicate<'tcx>(
     tcx: TyCtxt<'tcx>,
@@ -287,6 +288,37 @@ pub fn transitive_bounds<'tcx>(
     elaborate_trait_refs(tcx, bounds).filter_to_traits()
 }
 
+/// A specialized variant of `elaborate_trait_refs` that only elaborates trait references that may
+/// define the given associated type `assoc_name`. It uses the
+/// `super_predicates_that_define_assoc_type` query to avoid enumerating super-predicates that
+/// aren't related to `assoc_item`.  This is used when resolving types like `Self::Item` or
+/// `T::Item` and helps to avoid cycle errors (see e.g. #35237).
+pub fn transitive_bounds_that_define_assoc_type<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    bounds: impl Iterator<Item = ty::PolyTraitRef<'tcx>>,
+    assoc_name: Ident,
+) -> FxIndexSet<ty::PolyTraitRef<'tcx>> {
+    let mut stack: Vec<_> = bounds.collect();
+    let mut trait_refs = FxIndexSet::default();
+
+    while let Some(trait_ref) = stack.pop() {
+        if trait_refs.insert(trait_ref) {
+            let super_predicates =
+                tcx.super_predicates_that_define_assoc_type((trait_ref.def_id(), Some(assoc_name)));
+            for (super_predicate, _) in super_predicates.predicates {
+                let bound_predicate = super_predicate.bound_atom();
+                let subst_predicate = super_predicate
+                    .subst_supertrait(tcx, &bound_predicate.rebind(trait_ref.skip_binder()));
+                if let Some(binder) = subst_predicate.to_opt_poly_trait_ref() {
+                    stack.push(binder.value);
+                }
+            }
+        }
+    }
+
+    trait_refs
+}
+
 ///////////////////////////////////////////////////////////////////////////
 // Other
 ///////////////////////////////////////////////////////////////////////////

compiler/rustc_middle/src/query/mod.rs

@@ -433,12 +433,23 @@ rustc_queries! {
         /// full predicates are available (note that supertraits have
         /// additional acyclicity requirements).
         query super_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
-            desc { |tcx| "computing the supertraits of `{}`", tcx.def_path_str(key) }
+            desc { |tcx| "computing the super predicates of `{}`", tcx.def_path_str(key) }
+        }
+
+        /// The `Option<Ident>` is the name of an associated type. If it is `None`, then this query
+        /// returns the full set of predicates. If `Some<Ident>`, then the query returns only the
+        /// subset of super-predicates that reference traits that define the given associated type.
+        /// This is used to avoid cycles in resolving types like `T::Item`.
+        query super_predicates_that_define_assoc_type(key: (DefId, Option<rustc_span::symbol::Ident>)) -> ty::GenericPredicates<'tcx> {
+            desc { |tcx| "computing the super traits of `{}`{}",
+                tcx.def_path_str(key.0),
+                if let Some(assoc_name) = key.1 { format!(" with associated type name `{}`", assoc_name) } else { "".to_string() },
+            }
         }
 
         /// To avoid cycles within the predicates of a single item we compute
         /// per-type-parameter predicates for resolving `T::AssocTy`.
-        query type_param_predicates(key: (DefId, LocalDefId)) -> ty::GenericPredicates<'tcx> {
+        query type_param_predicates(key: (DefId, LocalDefId, rustc_span::symbol::Ident)) -> ty::GenericPredicates<'tcx> {
             desc { |tcx| "computing the bounds for type parameter `{}`", {
                 let id = tcx.hir().local_def_id_to_hir_id(key.1);
                 tcx.hir().ty_param_name(id)

compiler/rustc_middle/src/ty/context.rs

@@ -51,7 +51,7 @@ use rustc_session::config::{BorrowckMode, CrateType, OutputFilenames};
 use rustc_session::lint::{Level, Lint};
 use rustc_session::Session;
 use rustc_span::source_map::MultiSpan;
-use rustc_span::symbol::{kw, sym, Symbol};
+use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{Span, DUMMY_SP};
 use rustc_target::abi::{Layout, TargetDataLayout, VariantIdx};
 use rustc_target::spec::abi;
@@ -2085,6 +2085,42 @@ impl<'tcx> TyCtxt<'tcx> {
         self.mk_fn_ptr(sig.map_bound(|sig| ty::FnSig { unsafety: hir::Unsafety::Unsafe, ..sig }))
     }
 
+    /// Given the def_id of a Trait `trait_def_id` and the name of an associated item `assoc_name`
+    /// returns true if the `trait_def_id` defines an associated item of name `assoc_name`.
+    pub fn trait_may_define_assoc_type(self, trait_def_id: DefId, assoc_name: Ident) -> bool {
+        self.super_traits_of(trait_def_id).any(|trait_did| {
+            self.associated_items(trait_did)
+                .find_by_name_and_kind(self, assoc_name, ty::AssocKind::Type, trait_did)
+                .is_some()
+        })
+    }
+
+    /// Computes the def-ids of the transitive super-traits of `trait_def_id`. This (intentionally)
+    /// does not compute the full elaborated super-predicates but just the set of def-ids. It is used
+    /// to identify which traits may define a given associated type to help avoid cycle errors.
+    /// Returns a `DefId` iterator.
+    fn super_traits_of(self, trait_def_id: DefId) -> impl Iterator<Item = DefId> + 'tcx {
+        let mut set = FxHashSet::default();
+        let mut stack = vec![trait_def_id];
+
+        set.insert(trait_def_id);
+
+        iter::from_fn(move || -> Option<DefId> {
+            let trait_did = stack.pop()?;
+            let generic_predicates = self.super_predicates_of(trait_did);
+
+            for (predicate, _) in generic_predicates.predicates {
+                if let ty::PredicateAtom::Trait(data, _) = predicate.skip_binders() {
+                    if set.insert(data.def_id()) {
+                        stack.push(data.def_id());
+                    }
+                }
+            }
+
+            Some(trait_did)
+        })
+    }
+
     /// Given a closure signature, returns an equivalent fn signature. Detuples
     /// and so forth -- so e.g., if we have a sig with `Fn<(u32, i32)>` then
     /// you would get a `fn(u32, i32)`.

compiler/rustc_middle/src/ty/query/keys.rs

@@ -7,7 +7,7 @@ use crate::ty::subst::{GenericArg, SubstsRef};
 use crate::ty::{self, Ty, TyCtxt};
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
 use rustc_query_system::query::DefaultCacheSelector;
-use rustc_span::symbol::Symbol;
+use rustc_span::symbol::{Ident, Symbol};
 use rustc_span::{Span, DUMMY_SP};
 
 /// The `Key` trait controls what types can legally be used as the key
@@ -149,6 +149,28 @@ impl Key for (LocalDefId, DefId) {
     }
 }
 
+impl Key for (DefId, Option<Ident>) {
+    type CacheSelector = DefaultCacheSelector;
+
+    fn query_crate(&self) -> CrateNum {
+        self.0.krate
+    }
+    fn default_span(&self, tcx: TyCtxt<'_>) -> Span {
+        tcx.def_span(self.0)
+    }
+}
+
+impl Key for (DefId, LocalDefId, Ident) {
+    type CacheSelector = DefaultCacheSelector;
+
+    fn query_crate(&self) -> CrateNum {
+        self.0.krate
+    }
+    fn default_span(&self, tcx: TyCtxt<'_>) -> Span {
+        self.1.default_span(tcx)
+    }
+}
+
 impl Key for (CrateNum, DefId) {
     type CacheSelector = DefaultCacheSelector;
 

compiler/rustc_trait_selection/src/traits/mod.rs

@@ -65,7 +65,8 @@ pub use self::util::{
     get_vtable_index_of_object_method, impl_item_is_final, predicate_for_trait_def, upcast_choices,
 };
 pub use self::util::{
-    supertrait_def_ids, supertraits, transitive_bounds, SupertraitDefIds, Supertraits,
+    supertrait_def_ids, supertraits, transitive_bounds, transitive_bounds_that_define_assoc_type,
+    SupertraitDefIds, Supertraits,
 };
 
 pub use self::chalk_fulfill::FulfillmentContext as ChalkFulfillmentContext;

compiler/rustc_typeck/src/astconv/mod.rs

@@ -49,9 +49,10 @@ pub trait AstConv<'tcx> {
 
     fn default_constness_for_trait_bounds(&self) -> Constness;
 
-    /// Returns predicates in scope of the form `X: Foo`, where `X` is
-    /// a type parameter `X` with the given id `def_id`. This is a
-    /// subset of the full set of predicates.
+    /// Returns predicates in scope of the form `X: Foo<T>`, where `X`
+    /// is a type parameter `X` with the given id `def_id` and T
+    /// matches `assoc_name`. This is a subset of the full set of
+    /// predicates.
     ///
     /// This is used for one specific purpose: resolving "short-hand"
     /// associated type references like `T::Item`. In principle, we
@@ -60,7 +61,12 @@ pub trait AstConv<'tcx> {
     /// but this can lead to cycle errors. The problem is that we have
     /// to do this resolution *in order to create the predicates in
     /// the first place*. Hence, we have this "special pass".
-    fn get_type_parameter_bounds(&self, span: Span, def_id: DefId) -> ty::GenericPredicates<'tcx>;
+    fn get_type_parameter_bounds(
+        &self,
+        span: Span,
+        def_id: DefId,
+        assoc_name: Ident,
+    ) -> ty::GenericPredicates<'tcx>;
 
     /// Returns the lifetime to use when a lifetime is omitted (and not elided).
     fn re_infer(&self, param: Option<&ty::GenericParamDef>, span: Span)
@@ -762,7 +768,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
     }
 
     // Returns `true` if a bounds list includes `?Sized`.
-    pub fn is_unsized(&self, ast_bounds: &[hir::GenericBound<'_>], span: Span) -> bool {
+    pub fn is_unsized(&self, ast_bounds: &[&hir::GenericBound<'_>], span: Span) -> bool {
         let tcx = self.tcx();
 
         // Try to find an unbound in bounds.
@@ -820,7 +826,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
     fn add_bounds(
         &self,
         param_ty: Ty<'tcx>,
-        ast_bounds: &[hir::GenericBound<'_>],
+        ast_bounds: &[&hir::GenericBound<'_>],
         bounds: &mut Bounds<'tcx>,
     ) {
         let mut trait_bounds = Vec::new();
@@ -838,7 +844,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 hir::GenericBound::Trait(_, hir::TraitBoundModifier::Maybe) => {}
                 hir::GenericBound::LangItemTrait(lang_item, span, hir_id, args) => self
                     .instantiate_lang_item_trait_ref(
-                        lang_item, span, hir_id, args, param_ty, bounds,
+                        *lang_item, *span, *hir_id, args, param_ty, bounds,
                     ),
                 hir::GenericBound::Outlives(ref l) => region_bounds.push(l),
             }
@@ -875,6 +881,42 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
         ast_bounds: &[hir::GenericBound<'_>],
         sized_by_default: SizedByDefault,
         span: Span,
+    ) -> Bounds<'tcx> {
+        let ast_bounds: Vec<_> = ast_bounds.iter().collect();
+        self.compute_bounds_inner(param_ty, &ast_bounds, sized_by_default, span)
+    }
+
+    /// Convert the bounds in `ast_bounds` that refer to traits which define an associated type
+    /// named `assoc_name` into ty::Bounds. Ignore the rest.
+    pub fn compute_bounds_that_match_assoc_type(
+        &self,
+        param_ty: Ty<'tcx>,
+        ast_bounds: &[hir::GenericBound<'_>],
+        sized_by_default: SizedByDefault,
+        span: Span,
+        assoc_name: Ident,
+    ) -> Bounds<'tcx> {
+        let mut result = Vec::new();
+
+        for ast_bound in ast_bounds {
+            if let Some(trait_ref) = ast_bound.trait_ref() {
+                if let Some(trait_did) = trait_ref.trait_def_id() {
+                    if self.tcx().trait_may_define_assoc_type(trait_did, assoc_name) {
+                        result.push(ast_bound);
+                    }
+                }
+            }
+        }
+
+        self.compute_bounds_inner(param_ty, &result, sized_by_default, span)
+    }
+
+    fn compute_bounds_inner(
+        &self,
+        param_ty: Ty<'tcx>,
+        ast_bounds: &[&hir::GenericBound<'_>],
+        sized_by_default: SizedByDefault,
+        span: Span,
     ) -> Bounds<'tcx> {
         let mut bounds = Bounds::default();
 
@@ -1044,7 +1086,8 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 // Calling `skip_binder` is okay, because `add_bounds` expects the `param_ty`
                 // parameter to have a skipped binder.
                 let param_ty = tcx.mk_projection(assoc_ty.def_id, candidate.skip_binder().substs);
-                self.add_bounds(param_ty, ast_bounds, bounds);
+                let ast_bounds: Vec<_> = ast_bounds.iter().collect();
+                self.add_bounds(param_ty, &ast_bounds, bounds);
             }
         }
         Ok(())
@@ -1361,21 +1404,24 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             ty_param_def_id, assoc_name, span,
         );
 
-        let predicates =
-            &self.get_type_parameter_bounds(span, ty_param_def_id.to_def_id()).predicates;
+        let predicates = &self
+            .get_type_parameter_bounds(span, ty_param_def_id.to_def_id(), assoc_name)
+            .predicates;
 
         debug!("find_bound_for_assoc_item: predicates={:#?}", predicates);
 
         let param_hir_id = tcx.hir().local_def_id_to_hir_id(ty_param_def_id);
         let param_name = tcx.hir().ty_param_name(param_hir_id);
         self.one_bound_for_assoc_type(
             || {
-                traits::transitive_bounds(
+                traits::transitive_bounds_that_define_assoc_type(
                     tcx,
                     predicates.iter().filter_map(|(p, _)| {
                         p.to_opt_poly_trait_ref().map(|trait_ref| trait_ref.value)
                     }),
+                    assoc_name,
                 )
+                .into_iter()
             },
             || param_name.to_string(),
             assoc_name,

compiler/rustc_typeck/src/check/fn_ctxt/mod.rs

@@ -20,6 +20,7 @@ use rustc_middle::ty::fold::TypeFoldable;
 use rustc_middle::ty::subst::GenericArgKind;
 use rustc_middle::ty::{self, Const, Ty, TyCtxt};
 use rustc_session::Session;
+use rustc_span::symbol::Ident;
 use rustc_span::{self, Span};
 use rustc_trait_selection::traits::{ObligationCause, ObligationCauseCode};
 
@@ -183,7 +184,12 @@ impl<'a, 'tcx> AstConv<'tcx> for FnCtxt<'a, 'tcx> {
         }
     }
 
-    fn get_type_parameter_bounds(&self, _: Span, def_id: DefId) -> ty::GenericPredicates<'tcx> {
+    fn get_type_parameter_bounds(
+        &self,
+        _: Span,
+        def_id: DefId,
+        _: Ident,
+    ) -> ty::GenericPredicates<'tcx> {
         let tcx = self.tcx;
         let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local());
         let item_id = tcx.hir().ty_param_owner(hir_id);