1 files changed, 11 insertions, 8 deletions

diff --git a/crates/ra_hir_ty/src/traits/chalk.rs b/crates/ra_hir_ty/src/traits/chalk.rs
index 7a0f99dec..7f7fe93b7 100644
--- a/crates/ra_hir_ty/src/traits/chalk.rs
+++ b/crates/ra_hir_ty/src/traits/chalk.rs
@@ -18,7 +18,7 @@ use crate::{
 };
 
 #[derive(Debug, Copy, Clone, Hash, PartialOrd, Ord, PartialEq, Eq)]
-pub struct Interner {}
+pub struct Interner;
 
 impl chalk_ir::interner::Interner for Interner {
     type InternedType = Box<chalk_ir::TyData<Self>>;
@@ -59,7 +59,7 @@ impl chalk_ir::interner::Interner for Interner {
         None
     }
 
-    fn intern_ty(ty: chalk_ir::TyData<Self>) -> Box<chalk_ir::TyData<Self>> {
+    fn intern_ty(&self, ty: chalk_ir::TyData<Self>) -> Box<chalk_ir::TyData<Self>> {
         Box::new(ty)
     }
 
@@ -145,12 +145,12 @@ impl ToChalk for Ty {
             Ty::Apply(apply_ty) => {
                 let name = apply_ty.ctor.to_chalk(db);
                 let substitution = apply_ty.parameters.to_chalk(db);
-                chalk_ir::ApplicationTy { name, substitution }.cast().intern()
+                chalk_ir::ApplicationTy { name, substitution }.cast().intern(&Interner)
             }
             Ty::Projection(proj_ty) => {
                 let associated_ty_id = proj_ty.associated_ty.to_chalk(db);
                 let substitution = proj_ty.parameters.to_chalk(db);
-                chalk_ir::AliasTy { associated_ty_id, substitution }.cast().intern()
+                chalk_ir::AliasTy { associated_ty_id, substitution }.cast().intern(&Interner)
             }
             Ty::Placeholder(id) => {
                 let interned_id = db.intern_type_param_id(id);
@@ -158,9 +158,9 @@ impl ToChalk for Ty {
                     ui: UniverseIndex::ROOT,
                     idx: interned_id.as_intern_id().as_usize(),
                 }
-                .to_ty::<Interner>()
+                .to_ty::<Interner>(&Interner)
             }
-            Ty::Bound(idx) => chalk_ir::TyData::BoundVar(idx as usize).intern(),
+            Ty::Bound(idx) => chalk_ir::TyData::BoundVar(idx as usize).intern(&Interner),
             Ty::Infer(_infer_ty) => panic!("uncanonicalized infer ty"),
             Ty::Dyn(predicates) => {
                 let where_clauses = predicates
@@ -170,12 +170,12 @@ impl ToChalk for Ty {
                     .map(|p| p.to_chalk(db))
                     .collect();
                 let bounded_ty = chalk_ir::DynTy { bounds: make_binders(where_clauses, 1) };
-                chalk_ir::TyData::Dyn(bounded_ty).intern()
+                chalk_ir::TyData::Dyn(bounded_ty).intern(&Interner)
             }
             Ty::Opaque(_) | Ty::Unknown => {
                 let substitution = chalk_ir::Substitution::empty();
                 let name = TypeName::Error;
-                chalk_ir::ApplicationTy { name, substitution }.cast().intern()
+                chalk_ir::ApplicationTy { name, substitution }.cast().intern(&Interner)
             }
         }
     }
@@ -612,6 +612,9 @@ where
             _ => None,
         }
     }
+    fn interner(&self) -> &Interner {
+        &Interner
+    }
 }
 
 pub(crate) fn associated_ty_data_query(