Macro expansion code, export function parameter is &T

[wzjsun]

I have a structure TestStruct, When I take its reference as a parameter of an export function, it's OK, but once I put this export function in the macro, I will get the following error:

error[E0277]: the trait bound `&TestStruct: FromWasmAbi` is not satisfied
  --> src\style.rs:49:9
   |
49 |         #[wasm_bindgen]
   |         ^^^^^^^^^^^^^^^ the trait `FromWasmAbi` is not implemented for `&TestStruct`
...
55 | my_out_export!(&TestStruct);
   | --------------------------- in this macro invocation

The Code:

#[wasm_bindgen]
pub struct TestStruct(usize);

#[wasm_bindgen]
pub fn a_right_example(s: &TestStruct) { println!("a_right_example") }
macro_rules! my_out_export {
    ($x: ty) => {
        #[wasm_bindgen]
        pub fn a_error_example(s: $x) {
			println!("a_error_example")
		}
    };
}
my_out_export!(&TestStruct);