move code to InferCtxt method

Author: BoxyUwU

compiler/rustc_infer/src/infer/mod.rs

@@ -670,6 +670,22 @@ pub struct CombinedSnapshot<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
+    /// calls `tcx.try_unify_abstract_consts` after
+    /// canonicalizing the consts.
+    pub fn try_unify_abstract_consts(
+        &self,
+        a: ty::Unevaluated<'tcx>,
+        b: ty::Unevaluated<'tcx>,
+    ) -> bool {
+        let canonical = self.canonicalize_query(
+            ((a.def, a.substs), (b.def, b.substs)),
+            &mut OriginalQueryValues::default(),
+        );
+        debug!("canonical consts: {:?}", &canonical.value);
+
+        self.tcx.try_unify_abstract_consts(canonical.value)
+    }
+
     pub fn is_in_snapshot(&self) -> bool {
         self.in_snapshot.get()
     }

compiler/rustc_trait_selection/src/traits/fulfill.rs

@@ -4,7 +4,6 @@ use rustc_data_structures::obligation_forest::{Error, ForestObligation, Outcome}
 use rustc_data_structures::obligation_forest::{ObligationForest, ObligationProcessor};
 use rustc_errors::ErrorReported;
 use rustc_hir as hir;
-use rustc_infer::infer::canonical::OriginalQueryValues;
 use rustc_infer::traits::{SelectionError, TraitEngine, TraitEngineExt as _, TraitObligation};
 use rustc_middle::mir::abstract_const::NotConstEvaluatable;
 use rustc_middle::mir::interpret::ErrorHandled;
@@ -553,13 +552,7 @@ impl<'a, 'b, 'tcx> FulfillProcessor<'a, 'b, 'tcx> {
                         if let (ty::ConstKind::Unevaluated(a), ty::ConstKind::Unevaluated(b)) =
                             (c1.val, c2.val)
                         {
-                            let canonical = infcx.canonicalize_query(
-                                ((a.def, a.substs), (b.def, b.substs)),
-                                &mut OriginalQueryValues::default(),
-                            );
-                            debug!("canonical consts: {:?}", &canonical.value);
-
-                            if self.selcx.tcx().try_unify_abstract_consts(canonical.value) {
+                            if infcx.try_unify_abstract_consts(a, b) {
                                 return ProcessResult::Changed(vec![]);
                             }
                         }

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -33,7 +33,6 @@ use rustc_errors::ErrorReported;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::Constness;
-use rustc_infer::infer::canonical::OriginalQueryValues;
 use rustc_infer::infer::LateBoundRegionConversionTime;
 use rustc_middle::dep_graph::{DepKind, DepNodeIndex};
 use rustc_middle::mir::abstract_const::NotConstEvaluatable;
@@ -609,13 +608,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                         if let (ty::ConstKind::Unevaluated(a), ty::ConstKind::Unevaluated(b)) =
                             (c1.val, c2.val)
                         {
-                            let canonical = self.infcx.canonicalize_query(
-                                ((a.def, a.substs), (b.def, b.substs)),
-                                &mut OriginalQueryValues::default(),
-                            );
-                            debug!("canonical consts: {:?}", &canonical.value);
-
-                            if self.tcx().try_unify_abstract_consts(canonical.value) {
+                            if self.infcx.try_unify_abstract_consts(a, b) {
                                 return Ok(EvaluatedToOk);
                             }
                         }