implement the skeleton of the updated trait solver

compiler/rustc_infer/src/infer/canonical/query_response.rs

@@ -151,7 +151,11 @@ impl<'tcx> InferCtxt<'tcx> {
         })
     }
 
-    fn take_opaque_types_for_query_response(&self) -> Vec<(Ty<'tcx>, Ty<'tcx>)> {
+    /// FIXME: This method should only be used for canonical queries and therefore be private.
+    ///
+    /// As the new solver does canonicalization slightly differently, this is also used there
+    /// for now. This should hopefully change fairly soon.
+    pub fn take_opaque_types_for_query_response(&self) -> Vec<(Ty<'tcx>, Ty<'tcx>)> {
         self.inner
             .borrow_mut()
             .opaque_type_storage

compiler/rustc_middle/src/infer/canonical.rs

@@ -300,6 +300,16 @@ impl<'tcx, V> Canonical<'tcx, V> {
         let Canonical { max_universe, variables, value } = self;
         Canonical { max_universe, variables, value: map_op(value) }
     }
+
+    /// Allows you to map the `value` of a canonical while keeping the same set of
+    /// bound variables.
+    ///
+    /// **WARNING:** This function is very easy to mis-use, hence the name! See
+    /// the comment of [Canonical::unchecked_map] for more details.
+    pub fn unchecked_rebind<W>(self, value: W) -> Canonical<'tcx, W> {
+        let Canonical { max_universe, variables, value: _ } = self;
+        Canonical { max_universe, variables, value }
+    }
 }
 
 pub type QueryOutlivesConstraint<'tcx> = (

compiler/rustc_middle/src/traits/query.rs

@@ -96,7 +96,7 @@ pub type CanonicalTypeOpProvePredicateGoal<'tcx> =
 pub type CanonicalTypeOpNormalizeGoal<'tcx, T> =
     Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::Normalize<T>>>;
 
-#[derive(Copy, Clone, Debug, HashStable)]
+#[derive(Copy, Clone, Debug, HashStable, PartialEq, Eq)]
 pub struct NoSolution;
 
 pub type Fallible<T> = Result<T, NoSolution>;

compiler/rustc_middle/src/traits/specialization_graph.rs

@@ -180,6 +180,7 @@ impl Iterator for Ancestors<'_> {
 }
 
 /// Information about the most specialized definition of an associated item.
+#[derive(Debug)]
 pub struct LeafDef {
     /// The associated item described by this `LeafDef`.
     pub item: ty::AssocItem,

compiler/rustc_middle/src/ty/mod.rs

@@ -535,6 +535,17 @@ impl<'tcx> Predicate<'tcx> {
         self
     }
 
+    #[instrument(level = "debug", skip(tcx), ret)]
+    pub fn is_coinductive(self, tcx: TyCtxt<'tcx>) -> bool {
+        match self.kind().skip_binder() {
+            ty::PredicateKind::Clause(ty::Clause::Trait(data)) => {
+                tcx.trait_is_coinductive(data.def_id())
+            }
+            ty::PredicateKind::WellFormed(_) => true,
+            _ => false,
+        }
+    }
+
     /// Whether this projection can be soundly normalized.
     ///
     /// Wf predicates must not be normalized, as normalization
@@ -1018,6 +1029,24 @@ pub struct ProjectionPredicate<'tcx> {
     pub term: Term<'tcx>,
 }
 
+impl<'tcx> ProjectionPredicate<'tcx> {
+    pub fn self_ty(self) -> Ty<'tcx> {
+        self.projection_ty.self_ty()
+    }
+
+    pub fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> ProjectionPredicate<'tcx> {
+        Self { projection_ty: self.projection_ty.with_self_ty(tcx, self_ty), ..self }
+    }
+
+    pub fn trait_def_id(self, tcx: TyCtxt<'tcx>) -> DefId {
+        self.projection_ty.trait_def_id(tcx)
+    }
+
+    pub fn def_id(self) -> DefId {
+        self.projection_ty.def_id
+    }
+}
+
 pub type PolyProjectionPredicate<'tcx> = Binder<'tcx, ProjectionPredicate<'tcx>>;
 
 impl<'tcx> PolyProjectionPredicate<'tcx> {
@@ -1054,18 +1083,6 @@ impl<'tcx> PolyProjectionPredicate<'tcx> {
     }
 }
 
-impl<'tcx> ProjectionPredicate<'tcx> {
-    pub fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> Self {
-        Self {
-            projection_ty: tcx.mk_alias_ty(
-                self.projection_ty.def_id,
-                [self_ty.into()].into_iter().chain(self.projection_ty.substs.iter().skip(1)),
-            ),
-            ..self
-        }
-    }
-}
-
 pub trait ToPolyTraitRef<'tcx> {
     fn to_poly_trait_ref(&self) -> PolyTraitRef<'tcx>;
 }

compiler/rustc_middle/src/ty/sty.rs

@@ -1169,7 +1169,7 @@ pub struct AliasTy<'tcx> {
 }
 
 impl<'tcx> AliasTy<'tcx> {
-    pub fn trait_def_id(&self, tcx: TyCtxt<'tcx>) -> DefId {
+    pub fn trait_def_id(self, tcx: TyCtxt<'tcx>) -> DefId {
         match tcx.def_kind(self.def_id) {
             DefKind::AssocTy | DefKind::AssocConst => tcx.parent(self.def_id),
             DefKind::ImplTraitPlaceholder => {
@@ -1183,7 +1183,7 @@ impl<'tcx> AliasTy<'tcx> {
     /// For example, if this is a projection of `<T as StreamingIterator>::Item<'a>`,
     /// then this function would return a `T: Iterator` trait reference and `['a]` as the own substs
     pub fn trait_ref_and_own_substs(
-        &self,
+        self,
         tcx: TyCtxt<'tcx>,
     ) -> (ty::TraitRef<'tcx>, &'tcx [ty::GenericArg<'tcx>]) {
         debug_assert!(matches!(tcx.def_kind(self.def_id), DefKind::AssocTy | DefKind::AssocConst));
@@ -1202,14 +1202,18 @@ impl<'tcx> AliasTy<'tcx> {
     /// WARNING: This will drop the substs for generic associated types
     /// consider calling [Self::trait_ref_and_own_substs] to get those
     /// as well.
-    pub fn trait_ref(&self, tcx: TyCtxt<'tcx>) -> ty::TraitRef<'tcx> {
+    pub fn trait_ref(self, tcx: TyCtxt<'tcx>) -> ty::TraitRef<'tcx> {
         let def_id = self.trait_def_id(tcx);
         tcx.mk_trait_ref(def_id, self.substs.truncate_to(tcx, tcx.generics_of(def_id)))
     }
 
-    pub fn self_ty(&self) -> Ty<'tcx> {
+    pub fn self_ty(self) -> Ty<'tcx> {
         self.substs.type_at(0)
     }
+
+    pub fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> Self {
+        tcx.mk_alias_ty(self.def_id, [self_ty.into()].into_iter().chain(self.substs.iter().skip(1)))
+    }
 }
 
 #[derive(Copy, Clone, Debug, TypeFoldable, TypeVisitable, Lift)]

compiler/rustc_middle/src/ty/subst.rs

@@ -573,6 +573,10 @@ impl<T> EarlyBinder<T> {
     pub fn rebind<U>(&self, value: U) -> EarlyBinder<U> {
         EarlyBinder(value)
     }
+
+    pub fn skip_binder(self) -> T {
+        self.0
+    }
 }
 
 impl<T> EarlyBinder<Option<T>> {

compiler/rustc_trait_selection/src/lib.rs

@@ -19,6 +19,7 @@
 #![feature(let_chains)]
 #![feature(if_let_guard)]
 #![feature(never_type)]
+#![feature(result_option_inspect)]
 #![feature(type_alias_impl_trait)]
 #![recursion_limit = "512"] // For rustdoc
 
@@ -37,4 +38,5 @@ extern crate smallvec;
 pub mod autoderef;
 pub mod errors;
 pub mod infer;
+pub mod solve;
 pub mod traits;

compiler/rustc_trait_selection/src/solve/assembly.rs

@@ -0,0 +1,150 @@
+//! Code shared by trait and projection goals for candidate assembly.
+
+use super::infcx_ext::InferCtxtExt;
+use super::{
+    fixme_instantiate_canonical_query_response, CanonicalGoal, CanonicalResponse, Certainty,
+    EvalCtxt, Goal,
+};
+use rustc_hir::def_id::DefId;
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_infer::infer::{
+    canonical::{CanonicalVarValues, OriginalQueryValues},
+    InferCtxt,
+};
+use rustc_infer::traits::query::NoSolution;
+use rustc_middle::ty::TypeFoldable;
+use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_span::DUMMY_SP;
+use std::fmt::Debug;
+
+/// A candidate is a possible way to prove a goal.
+///
+/// It consists of both the `source`, which describes how that goal would be proven,
+/// and the `result` when using the given `source`.
+///
+/// For the list of possible candidates, please look at the documentation of
+/// [super::trait_goals::CandidateSource] and [super::project_goals::CandidateSource].
+#[derive(Debug, Clone)]
+pub(super) struct Candidate<'tcx, G: GoalKind<'tcx>> {
+    pub(super) source: G::CandidateSource,
+    pub(super) result: CanonicalResponse<'tcx>,
+}
+
+pub(super) trait GoalKind<'tcx>: TypeFoldable<'tcx> + Copy {
+    type CandidateSource: Debug + Copy;
+
+    fn self_ty(self) -> Ty<'tcx>;
+
+    fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> Self;
+
+    fn trait_def_id(self, tcx: TyCtxt<'tcx>) -> DefId;
+
+    fn consider_impl_candidate(
+        acx: &mut AssemblyCtxt<'_, 'tcx, Self>,
+        goal: Goal<'tcx, Self>,
+        impl_def_id: DefId,
+    );
+}
+
+/// An abstraction which correctly deals with the canonical results for candidates.
+///
+/// It also deduplicates the behavior between trait and projection predicates.
+pub(super) struct AssemblyCtxt<'a, 'tcx, G: GoalKind<'tcx>> {
+    pub(super) cx: &'a mut EvalCtxt<'tcx>,
+    pub(super) infcx: &'a InferCtxt<'tcx>,
+    var_values: CanonicalVarValues<'tcx>,
+    candidates: Vec<Candidate<'tcx, G>>,
+}
+
+impl<'a, 'tcx, G: GoalKind<'tcx>> AssemblyCtxt<'a, 'tcx, G> {
+    pub(super) fn assemble_and_evaluate_candidates(
+        cx: &'a mut EvalCtxt<'tcx>,
+        goal: CanonicalGoal<'tcx, G>,
+    ) -> Vec<Candidate<'tcx, G>> {
+        let (ref infcx, goal, var_values) =
+            cx.tcx.infer_ctxt().build_with_canonical(DUMMY_SP, &goal);
+        let mut acx = AssemblyCtxt { cx, infcx, var_values, candidates: Vec::new() };
+
+        acx.assemble_candidates_after_normalizing_self_ty(goal);
+
+        acx.assemble_impl_candidates(goal);
+
+        acx.candidates
+    }
+
+    pub(super) fn try_insert_candidate(
+        &mut self,
+        source: G::CandidateSource,
+        certainty: Certainty,
+    ) {
+        match self.infcx.make_canonical_response(self.var_values.clone(), certainty) {
+            Ok(result) => self.candidates.push(Candidate { source, result }),
+            Err(NoSolution) => debug!(?source, ?certainty, "failed leakcheck"),
+        }
+    }
+
+    /// If the self type of a goal is a projection, computing the relevant candidates is difficult.
+    ///
+    /// To deal with this, we first try to normalize the self type and add the candidates for the normalized
+    /// self type to the list of candidates in case that succeeds. Note that we can't just eagerly return in
+    /// this case as projections as self types add `
+    fn assemble_candidates_after_normalizing_self_ty(&mut self, goal: Goal<'tcx, G>) {
+        let tcx = self.cx.tcx;
+        // FIXME: We also have to normalize opaque types, not sure where to best fit that in.
+        let &ty::Alias(ty::Projection, projection_ty) = goal.predicate.self_ty().kind() else {
+            return
+        };
+        self.infcx.probe(|_| {
+            let normalized_ty = self.infcx.next_ty_infer();
+            let normalizes_to_goal = goal.with(
+                tcx,
+                ty::Binder::dummy(ty::ProjectionPredicate {
+                    projection_ty,
+                    term: normalized_ty.into(),
+                }),
+            );
+            let normalization_certainty =
+                match self.cx.evaluate_goal(&self.infcx, normalizes_to_goal) {
+                    Ok((_, certainty)) => certainty,
+                    Err(NoSolution) => return,
+                };
+
+            // NOTE: Alternatively we could call `evaluate_goal` here and only have a `Normalized` candidate.
+            // This doesn't work as long as we use `CandidateSource` in both winnowing and to resolve associated items.
+            let goal = goal.with(tcx, goal.predicate.with_self_ty(tcx, normalized_ty));
+            let mut orig_values = OriginalQueryValues::default();
+            let goal = self.infcx.canonicalize_query(goal, &mut orig_values);
+            let normalized_candidates =
+                AssemblyCtxt::assemble_and_evaluate_candidates(self.cx, goal);
+
+            // Map each candidate from being canonical wrt the current inference context to being
+            // canonical wrt the caller.
+            for Candidate { source, result } in normalized_candidates {
+                self.infcx.probe(|_| {
+                    let candidate_certainty = fixme_instantiate_canonical_query_response(
+                        &self.infcx,
+                        &orig_values,
+                        result,
+                    );
+
+                    // FIXME: This is a bit scary if the `normalizes_to_goal` overflows.
+                    //
+                    // If we have an ambiguous candidate it hides that normalization
+                    // caused an overflow which may cause issues.
+                    self.try_insert_candidate(
+                        source,
+                        normalization_certainty.unify_and(candidate_certainty),
+                    )
+                })
+            }
+        })
+    }
+
+    fn assemble_impl_candidates(&mut self, goal: Goal<'tcx, G>) {
+        self.cx.tcx.for_each_relevant_impl(
+            goal.predicate.trait_def_id(self.cx.tcx),
+            goal.predicate.self_ty(),
+            |impl_def_id| G::consider_impl_candidate(self, goal, impl_def_id),
+        );
+    }
+}