1 files changed, 2 insertions, 3 deletions

diff --git a/crates/ra_hir_ty/src/lib.rs b/crates/ra_hir_ty/src/lib.rs
index 302bb8aa2..13c5e6c6b 100644
--- a/crates/ra_hir_ty/src/lib.rs
+++ b/crates/ra_hir_ty/src/lib.rs
@@ -763,8 +763,8 @@ pub trait TypeWalk {
         Self: Sized,
     {
         self.walk_mut_binders(
-            &mut |ty, binders| match ty {
-                &mut Ty::Bound(idx) => {
+            &mut |ty, binders| {
+                if let &mut Ty::Bound(idx) = ty {
                     if idx as usize >= binders && (idx as usize - binders) < substs.len() {
                         *ty = substs.0[idx as usize - binders].clone();
                     } else if idx as usize >= binders + substs.len() {
@@ -772,7 +772,6 @@ pub trait TypeWalk {
                         *ty = Ty::Bound(idx - substs.len() as u32);
                     }
                 }
-                _ => {}
             },
             0,
         );