diff --git a/lang/src/son.rs b/lang/src/son.rs
index 3ad3322..84d690c 100644
--- a/lang/src/son.rs
+++ b/lang/src/son.rs
@@ -105,7 +105,7 @@ impl Nodes {
     }
 
     fn as_ty(&self, cint: Nid) -> ty::Id {
-        if self[citn].ty == ty::Id::NEVER {
+        if self[cint].ty == ty::Id::NEVER {
             return ty::Id::NEVER;
         }
         debug_assert_eq!(self[cint].ty, ty::Id::TYPE);