Rollup merge of #109410 - fmease:iat-alias-kind-inherent, r=compiler-errors

Introduce `AliasKind::Inherent` for inherent associated types

Allows us to check (possibly generic) inherent associated types for well-formedness.
Type inference now also works properly.

Follow-up to #105961. Supersedes #108430.
Fixes #106722.
Fixes #108957.
Fixes #109768.
Fixes #109789.
Fixes #109790.

~Not to be merged before #108860 (`AliasKind::Weak`).~

CC `@jackh726`
r? `@compiler-errors`

`@rustbot` label T-types F-inherent_associated_types

Author: compiler-errors

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -2419,6 +2419,10 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             return Ok(None);
         }
 
+        //
+        // Select applicable inherent associated type candidates modulo regions.
+        //
+
         // In contexts that have no inference context, just make a new one.
         // We do need a local variable to store it, though.
         let infcx_;
@@ -2431,14 +2435,18 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             }
         };
 
-        let param_env = tcx.param_env(block.owner.to_def_id());
+        // FIXME(inherent_associated_types): Acquiring the ParamEnv this early leads to cycle errors
+        // when inside of an ADT (#108491) or where clause.
+        let param_env = tcx.param_env(block.owner);
         let cause = ObligationCause::misc(span, block.owner.def_id);
 
         let mut fulfillment_errors = Vec::new();
         let mut applicable_candidates: Vec<_> = infcx.probe(|_| {
             let universe = infcx.create_next_universe();
 
             // Regions are not considered during selection.
+            // FIXME(non_lifetime_binders): Here we are "truncating" or "flattening" the universes
+            // of type and const binders. Is that correct in the selection phase? See also #109505.
             let self_ty = tcx.replace_escaping_bound_vars_uncached(
                 self_ty,
                 FnMutDelegate {
@@ -2454,41 +2462,40 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
 
             candidates
                 .iter()
-                .filter_map(|&(impl_, (assoc_item, def_scope))| {
+                .copied()
+                .filter(|&(impl_, _)| {
                     infcx.probe(|_| {
                         let ocx = ObligationCtxt::new_in_snapshot(&infcx);
 
-                        let impl_ty = tcx.type_of(impl_);
                         let impl_substs = infcx.fresh_item_substs(impl_);
-                        let impl_ty = impl_ty.subst(tcx, impl_substs);
+                        let impl_ty = tcx.type_of(impl_).subst(tcx, impl_substs);
                         let impl_ty = ocx.normalize(&cause, param_env, impl_ty);
 
-                        // Check that the Self-types can be related.
-                        // FIXME(fmease): Should we use `eq` here?
-                        ocx.sup(&ObligationCause::dummy(), param_env, impl_ty, self_ty).ok()?;
+                        // Check that the self types can be related.
+                        // FIXME(inherent_associated_types): Should we use `eq` here? Method probing uses
+                        // `sup` for this situtation, too. What for? To constrain inference variables?
+                        if ocx.sup(&ObligationCause::dummy(), param_env, impl_ty, self_ty).is_err()
+                        {
+                            return false;
+                        }
 
                         // Check whether the impl imposes obligations we have to worry about.
-                        let impl_bounds = tcx.predicates_of(impl_);
-                        let impl_bounds = impl_bounds.instantiate(tcx, impl_substs);
-
+                        let impl_bounds = tcx.predicates_of(impl_).instantiate(tcx, impl_substs);
                         let impl_bounds = ocx.normalize(&cause, param_env, impl_bounds);
-
                         let impl_obligations = traits::predicates_for_generics(
                             |_, _| cause.clone(),
                             param_env,
                             impl_bounds,
                         );
-
                         ocx.register_obligations(impl_obligations);
 
                         let mut errors = ocx.select_where_possible();
                         if !errors.is_empty() {
                             fulfillment_errors.append(&mut errors);
-                            return None;
+                            return false;
                         }
 
-                        // FIXME(fmease): Unsolved vars can escape this InferCtxt snapshot.
-                        Some((assoc_item, def_scope, infcx.resolve_vars_if_possible(impl_substs)))
+                        true
                     })
                 })
                 .collect()
@@ -2497,24 +2504,26 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
         if applicable_candidates.len() > 1 {
             return Err(self.complain_about_ambiguous_inherent_assoc_type(
                 name,
-                applicable_candidates.into_iter().map(|(candidate, ..)| candidate).collect(),
+                applicable_candidates.into_iter().map(|(_, (candidate, _))| candidate).collect(),
                 span,
             ));
         }
 
-        if let Some((assoc_item, def_scope, impl_substs)) = applicable_candidates.pop() {
+        if let Some((impl_, (assoc_item, def_scope))) = applicable_candidates.pop() {
             self.check_assoc_ty(assoc_item, name, def_scope, block, span);
 
-            // FIXME(inherent_associated_types): To fully *confirm* the *probed* candidate, we still
-            // need to relate the Self-type with fresh item substs & register region obligations for
-            // regionck to prove/disprove.
-
-            let item_substs =
-                self.create_substs_for_associated_item(span, assoc_item, segment, impl_substs);
+            // FIXME(fmease): Currently creating throwaway `parent_substs` to please
+            // `create_substs_for_associated_item`. Modify the latter instead (or sth. similar) to
+            // not require the parent substs logic.
+            let parent_substs = InternalSubsts::identity_for_item(tcx, impl_);
+            let substs =
+                self.create_substs_for_associated_item(span, assoc_item, segment, parent_substs);
+            let substs = tcx.mk_substs_from_iter(
+                std::iter::once(ty::GenericArg::from(self_ty))
+                    .chain(substs.into_iter().skip(parent_substs.len())),
+            );
 
-            // FIXME(fmease, #106722): Check if the bounds on the parameters of the
-            // associated type hold, if any.
-            let ty = tcx.type_of(assoc_item).subst(tcx, item_substs);
+            let ty = tcx.mk_alias(ty::Inherent, tcx.mk_alias_ty(assoc_item, substs));
 
             return Ok(Some((ty, assoc_item)));
         }

compiler/rustc_hir_analysis/src/coherence/orphan.rs

@@ -210,6 +210,19 @@ fn do_orphan_check_impl<'tcx>(
                 NonlocalImpl::DisallowOther,
             ),
 
+            // ```
+            // struct S<T>(T);
+            // impl<T: ?Sized> S<T> {
+            //     type This = T;
+            // }
+            // impl<T: ?Sized> AutoTrait for S<T>::This {}
+            // ```
+            // FIXME(inherent_associated_types): The example code above currently leads to a cycle
+            ty::Alias(AliasKind::Inherent, _) => (
+                LocalImpl::Disallow { problematic_kind: "associated type" },
+                NonlocalImpl::DisallowOther,
+            ),
+
             // type Opaque = impl Trait;
             // impl AutoTrait for Opaque {}
             ty::Alias(AliasKind::Opaque, _) => (

compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs

@@ -1948,7 +1948,7 @@ fn is_late_bound_map(
                 ty::Param(param_ty) => {
                     self.arg_is_constrained[param_ty.index as usize] = true;
                 }
-                ty::Alias(ty::Projection, _) => return ControlFlow::Continue(()),
+                ty::Alias(ty::Projection | ty::Inherent, _) => return ControlFlow::Continue(()),
                 _ => (),
             }
             t.super_visit_with(self)

compiler/rustc_hir_analysis/src/collect/type_of.rs

@@ -127,7 +127,7 @@ fn anon_const_type_of<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> Ty<'tcx> {
             // the def_id that this query was called with. We filter to only type and const args here
             // as a precaution for if it's ever allowed to elide lifetimes in GAT's. It currently isn't
             // but it can't hurt to be safe ^^
-            if let ty::Alias(ty::Projection, projection) = ty.kind() {
+            if let ty::Alias(ty::Projection | ty::Inherent, projection) = ty.kind() {
                 let generics = tcx.generics_of(projection.def_id);
 
                 let arg_index = segment

compiler/rustc_hir_analysis/src/constrained_generic_params.rs

@@ -59,7 +59,7 @@ struct ParameterCollector {
 impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ParameterCollector {
     fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
         match *t.kind() {
-            ty::Alias(ty::Projection, ..) if !self.include_nonconstraining => {
+            ty::Alias(ty::Projection | ty::Inherent, ..) if !self.include_nonconstraining => {
                 // projections are not injective
                 return ControlFlow::Continue(());
             }

compiler/rustc_hir_analysis/src/outlives/implicit_infer.rs

@@ -210,6 +210,9 @@ fn insert_required_predicates_to_be_wf<'tcx>(
                 );
             }
 
+            // FIXME(inherent_associated_types): Handle this case properly.
+            ty::Alias(ty::Inherent, _) => {}
+
             _ => {}
         }
     }

compiler/rustc_hir_typeck/src/fn_ctxt/adjust_fulfillment_errors.rs

@@ -843,7 +843,7 @@ fn find_param_in_ty<'tcx>(
             return true;
         }
         if let ty::GenericArgKind::Type(ty) = arg.unpack()
-                && let ty::Alias(ty::Projection, ..) = ty.kind()
+                && let ty::Alias(ty::Projection | ty::Inherent, ..) = ty.kind()
             {
                 // This logic may seem a bit strange, but typically when
                 // we have a projection type in a function signature, the

compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs

@@ -300,7 +300,7 @@ impl<'a, 'tcx> AstConv<'tcx> for FnCtxt<'a, 'tcx> {
         match ty.kind() {
             ty::Adt(adt_def, _) => Some(*adt_def),
             // FIXME(#104767): Should we handle bound regions here?
-            ty::Alias(ty::Projection, _) if !ty.has_escaping_bound_vars() => {
+            ty::Alias(ty::Projection | ty::Inherent, _) if !ty.has_escaping_bound_vars() => {
                 self.normalize(span, ty).ty_adt_def()
             }
             _ => None,

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -2211,7 +2211,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         | ty::Float(_)
                         | ty::Adt(_, _)
                         | ty::Str
-                        | ty::Alias(ty::Projection, _)
+                        | ty::Alias(ty::Projection | ty::Inherent, _)
                         | ty::Param(_) => format!("{deref_ty}"),
                         // we need to test something like  <&[_]>::len or <(&[u32])>::len
                         // and Vec::function();

compiler/rustc_infer/src/infer/combine.rs

@@ -127,7 +127,8 @@ impl<'tcx> InferCtxt<'tcx> {
                 bug!()
             }
 
-            (_, ty::Alias(AliasKind::Projection, _)) | (ty::Alias(AliasKind::Projection, _), _)
+            (_, ty::Alias(AliasKind::Projection | AliasKind::Inherent, _))
+            | (ty::Alias(AliasKind::Projection | AliasKind::Inherent, _), _)
                 if self.tcx.trait_solver_next() =>
             {
                 relation.register_type_relate_obligation(a, b);