Make ProofTreeBuilder actually generic over interner

compiler/rustc_middle/src/ty/context.rs

@@ -218,6 +218,13 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
         self.check_and_mk_args(def_id, args)
     }
 
+    fn intern_canonical_goal_evaluation_step(
+        self,
+        step: solve::inspect::CanonicalGoalEvaluationStep<TyCtxt<'tcx>>,
+    ) -> &'tcx solve::inspect::CanonicalGoalEvaluationStep<TyCtxt<'tcx>> {
+        self.arena.alloc(step)
+    }
+
     fn parent(self, def_id: Self::DefId) -> Self::DefId {
         self.parent(def_id)
     }

compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs

@@ -16,7 +16,6 @@ use crate::solve::{
 use rustc_data_structures::fx::FxHashSet;
 use rustc_index::IndexVec;
 use rustc_infer::infer::canonical::query_response::make_query_region_constraints;
-use rustc_infer::infer::canonical::CanonicalVarValues;
 use rustc_infer::infer::canonical::{CanonicalExt, QueryRegionConstraints};
 use rustc_infer::infer::RegionVariableOrigin;
 use rustc_infer::infer::{InferCtxt, InferOk};
@@ -32,22 +31,24 @@ use rustc_middle::ty::{self, BoundVar, GenericArgKind, Ty, TyCtxt, TypeFoldable}
 use rustc_next_trait_solver::canonicalizer::{CanonicalizeMode, Canonicalizer};
 use rustc_next_trait_solver::resolve::EagerResolver;
 use rustc_span::{Span, DUMMY_SP};
+use rustc_type_ir::CanonicalVarValues;
+use rustc_type_ir::{InferCtxtLike, Interner};
 use std::assert_matches::assert_matches;
 use std::iter;
 use std::ops::Deref;
 
 trait ResponseT<'tcx> {
-    fn var_values(&self) -> CanonicalVarValues<'tcx>;
+    fn var_values(&self) -> CanonicalVarValues<TyCtxt<'tcx>>;
 }
 
 impl<'tcx> ResponseT<'tcx> for Response<TyCtxt<'tcx>> {
-    fn var_values(&self) -> CanonicalVarValues<'tcx> {
+    fn var_values(&self) -> CanonicalVarValues<TyCtxt<'tcx>> {
         self.var_values
     }
 }
 
 impl<'tcx, T> ResponseT<'tcx> for inspect::State<TyCtxt<'tcx>, T> {
-    fn var_values(&self) -> CanonicalVarValues<'tcx> {
+    fn var_values(&self) -> CanonicalVarValues<TyCtxt<'tcx>> {
         self.var_values
     }
 }
@@ -260,7 +261,7 @@ impl<'tcx> EvalCtxt<'_, InferCtxt<'tcx>> {
         infcx: &InferCtxt<'tcx>,
         original_values: &[ty::GenericArg<'tcx>],
         response: &Canonical<'tcx, T>,
-    ) -> CanonicalVarValues<'tcx> {
+    ) -> CanonicalVarValues<TyCtxt<'tcx>> {
         // FIXME: Longterm canonical queries should deal with all placeholders
         // created inside of the query directly instead of returning them to the
         // caller.
@@ -354,7 +355,7 @@ impl<'tcx> EvalCtxt<'_, InferCtxt<'tcx>> {
         infcx: &InferCtxt<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
         original_values: &[ty::GenericArg<'tcx>],
-        var_values: CanonicalVarValues<'tcx>,
+        var_values: CanonicalVarValues<TyCtxt<'tcx>>,
     ) {
         assert_eq!(original_values.len(), var_values.len());
 
@@ -393,13 +394,18 @@ impl<'tcx> EvalCtxt<'_, InferCtxt<'tcx>> {
 /// evaluating a goal. The `var_values` not only include the bound variables
 /// of the query input, but also contain all unconstrained inference vars
 /// created while evaluating this goal.
-pub(in crate::solve) fn make_canonical_state<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
-    infcx: &InferCtxt<'tcx>,
-    var_values: &[ty::GenericArg<'tcx>],
+pub(in crate::solve) fn make_canonical_state<Infcx, T, I>(
+    infcx: &Infcx,
+    var_values: &[I::GenericArg],
     max_input_universe: ty::UniverseIndex,
     data: T,
-) -> inspect::CanonicalState<TyCtxt<'tcx>, T> {
-    let var_values = CanonicalVarValues { var_values: infcx.tcx.mk_args(var_values) };
+) -> inspect::CanonicalState<I, T>
+where
+    Infcx: InferCtxtLike<Interner = I>,
+    I: Interner,
+    T: TypeFoldable<I>,
+{
+    let var_values = CanonicalVarValues { var_values: infcx.interner().mk_args(var_values) };
     let state = inspect::State { var_values, data };
     let state = state.fold_with(&mut EagerResolver::new(infcx));
     Canonicalizer::canonicalize(

compiler/rustc_trait_selection/src/solve/eval_ctxt/mod.rs

@@ -98,7 +98,7 @@ pub struct EvalCtxt<
     // evaluation code.
     tainted: Result<(), NoSolution>,
 
-    pub(super) inspect: ProofTreeBuilder<I>,
+    pub(super) inspect: ProofTreeBuilder<Infcx>,
 }
 
 #[derive(derivative::Derivative)]
@@ -218,7 +218,7 @@ impl<'a, 'tcx> EvalCtxt<'a, InferCtxt<'tcx>> {
         tcx: TyCtxt<'tcx>,
         search_graph: &'a mut search_graph::SearchGraph<TyCtxt<'tcx>>,
         canonical_input: CanonicalInput<'tcx>,
-        canonical_goal_evaluation: &mut ProofTreeBuilder<TyCtxt<'tcx>>,
+        canonical_goal_evaluation: &mut ProofTreeBuilder<InferCtxt<'tcx>>,
         f: impl FnOnce(&mut EvalCtxt<'_, InferCtxt<'tcx>>, Goal<'tcx, ty::Predicate<'tcx>>) -> R,
     ) -> R {
         let intercrate = match search_graph.solver_mode() {
@@ -280,7 +280,7 @@ impl<'a, 'tcx> EvalCtxt<'a, InferCtxt<'tcx>> {
         tcx: TyCtxt<'tcx>,
         search_graph: &'a mut search_graph::SearchGraph<TyCtxt<'tcx>>,
         canonical_input: CanonicalInput<'tcx>,
-        goal_evaluation: &mut ProofTreeBuilder<TyCtxt<'tcx>>,
+        goal_evaluation: &mut ProofTreeBuilder<InferCtxt<'tcx>>,
     ) -> QueryResult<'tcx> {
         let mut canonical_goal_evaluation =
             goal_evaluation.new_canonical_goal_evaluation(canonical_input);
@@ -1114,7 +1114,7 @@ struct ReplaceAliasWithInfer<'me, 'a, 'tcx> {
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ReplaceAliasWithInfer<'_, '_, 'tcx> {
     fn interner(&self) -> TyCtxt<'tcx> {
-        self.ecx.tcx()
+        self.ecx.interner()
     }
 
     fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {