diff --git a/lib/api/src/externals/function.rs b/lib/api/src/externals/function.rs
index bd3bf7dbe..cd371cbfd 100644
--- a/lib/api/src/externals/function.rs
+++ b/lib/api/src/externals/function.rs
@@ -597,35 +597,6 @@ mod inner {
         }
     }
 
-    impl WasmTypeList for Infallible {
-        type CStruct = Self;
-        type Array = [i128; 0];
-
-        fn from_array(_: Self::Array) -> Self {
-            unreachable!()
-        }
-
-        fn into_array(self) -> Self::Array {
-            []
-        }
-
-        fn empty_array() -> Self::Array {
-            unreachable!()
-        }
-
-        fn from_c_struct(_: Self::CStruct) -> Self {
-            unreachable!()
-        }
-
-        fn into_c_struct(self) -> Self::CStruct {
-            unreachable!()
-        }
-
-        fn wasm_types() -> &'static [Type] {
-            &[]
-        }
-    }
-
     macro_rules! impl_traits {
         ( [$repr:ident] $struct_name:ident, $( $x:ident ),* ) => {
             /// Struct for typed funcs.
@@ -759,7 +730,7 @@ mod inner {
         }};
     }
 
-    //impl_traits!([C] S0,);
+    impl_traits!([C] S0,);
     //impl_traits!([transparent] S1, A1);
     impl_traits!([C] S2, A1, A2);
     impl_traits!([C] S3, A1, A2, A3);