1 files changed, 2 insertions, 1 deletions

diff --git a/crates/ra_hir_ty/src/method_resolution.rs b/crates/ra_hir_ty/src/method_resolution.rs
index 8b59a8bd6..c19519cf1 100644
--- a/crates/ra_hir_ty/src/method_resolution.rs
+++ b/crates/ra_hir_ty/src/method_resolution.rs
@@ -281,6 +281,7 @@ pub fn iterate_method_candidates<T>(
         name,
         mode,
         &mut |ty, item| {
+            assert!(slot.is_none());
             slot = callback(ty, item);
             slot.is_some()
         },
@@ -288,7 +289,7 @@ pub fn iterate_method_candidates<T>(
     slot
 }
 
-pub fn iterate_method_candidates_impl(
+fn iterate_method_candidates_impl(
     ty: &Canonical<Ty>,
     db: &dyn HirDatabase,
     env: Arc<TraitEnvironment>,