Make type walking infrastructure a bit nicer

If/when we switch to using Chalk's Ty, we'll need to replace this by its `Fold`
trait, but I didn't want to import the whole thing just yet.

1 files changed, 1 insertions, 0 deletions

diff --git a/crates/ra_hir/src/ty/traits/chalk.rs b/crates/ra_hir/src/ty/traits/chalk.rs
index 3ab5b7cca..c201c5e50 100644
--- a/crates/ra_hir/src/ty/traits/chalk.rs
+++ b/crates/ra_hir/src/ty/traits/chalk.rs
@@ -19,6 +19,7 @@ use crate::{
     ty::display::HirDisplay,
     ty::{
         ApplicationTy, CallableDef, GenericPredicate, ProjectionTy, Substs, TraitRef, Ty, TypeCtor,
+        TypeWalk,
     },
     Crate, HasGenericParams, ImplBlock, ImplItem, Trait, TypeAlias,
 };