1 files changed, 10 insertions, 6 deletions

diff --git a/crates/ra_hir_ty/src/traits.rs b/crates/ra_hir_ty/src/traits.rs
index a1ca33c98..07854a062 100644
--- a/crates/ra_hir_ty/src/traits.rs
+++ b/crates/ra_hir_ty/src/traits.rs
@@ -7,7 +7,7 @@ use ra_db::{impl_intern_key, salsa, CrateId};
 use ra_prof::profile;
 use rustc_hash::FxHashSet;
 
-use crate::db::HirDatabase;
+use crate::{db::HirDatabase, DebruijnIndex};
 
 use super::{Canonical, GenericPredicate, HirDisplay, ProjectionTy, TraitRef, Ty, TypeWalk};
 
@@ -128,7 +128,11 @@ impl TypeWalk for ProjectionPredicate {
         self.ty.walk(f);
     }
 
-    fn walk_mut_binders(&mut self, f: &mut impl FnMut(&mut Ty, usize), binders: usize) {
+    fn walk_mut_binders(
+        &mut self,
+        f: &mut impl FnMut(&mut Ty, DebruijnIndex),
+        binders: DebruijnIndex,
+    ) {
         self.projection_ty.walk_mut_binders(f, binders);
         self.ty.walk_mut_binders(f, binders);
     }
@@ -144,7 +148,7 @@ pub(crate) fn trait_solve_query(
         Obligation::Trait(it) => db.trait_data(it.trait_).name.to_string(),
         Obligation::Projection(_) => "projection".to_string(),
     });
-    log::debug!("trait_solve_query({})", goal.value.value.display(db));
+    eprintln!("trait_solve_query({})", goal.value.value.display(db));
 
     if let Obligation::Projection(pred) = &goal.value.value {
         if let Ty::Bound(_) = &pred.projection_ty.parameters[0] {
@@ -153,7 +157,7 @@ pub(crate) fn trait_solve_query(
         }
     }
 
-    let canonical = goal.to_chalk(db).cast();
+    let canonical = goal.to_chalk(db).cast(&Interner);
 
     // We currently don't deal with universes (I think / hope they're not yet
     // relevant for our use cases?)
@@ -194,8 +198,8 @@ fn solution_from_chalk(
     let convert_subst = |subst: chalk_ir::Canonical<chalk_ir::Substitution<Interner>>| {
         let value = subst
             .value
-            .into_iter()
-            .map(|p| match p.ty() {
+            .iter(&Interner)
+            .map(|p| match p.ty(&Interner) {
                 Some(ty) => from_chalk(db, ty.clone()),
                 None => unimplemented!(),
             })