diff --git a/crates/hir_ty/src/lib.rs b/crates/hir_ty/src/lib.rs
index 4c3d904bf9..a8ddb43f55 100644
--- a/crates/hir_ty/src/lib.rs
+++ b/crates/hir_ty/src/lib.rs
@@ -810,6 +810,12 @@ impl TypeWalk for CallableSig {
     }
 }
 
+struct TyBuilder {}
+
+impl TyBuilder {
+
+}
+
 impl Ty {
     pub fn unit() -> Self {
         TyKind::Tuple(0, Substitution::empty(&Interner)).intern(&Interner)