diff --git a/luisa_compute/examples/custom_op.rs b/luisa_compute/examples/custom_op.rs
index 08be4bc..0e5125f 100644
--- a/luisa_compute/examples/custom_op.rs
+++ b/luisa_compute/examples/custom_op.rs
@@ -4,12 +4,6 @@ use luisa::lang::external::CpuFn;
 use luisa::prelude::*;
 use luisa_compute as luisa;
 
-#[derive(Clone, Copy, Value, IoTexel, Debug)]
-#[repr(transparent)]
-struct Foo {
-    x: u32,
-}
-
 #[derive(Clone, Copy, Value, Debug)]
 #[repr(C)]
 #[value_new(pub)]