Test multiple attribute-like macros used on the same function - especially order

[loredanacirstea]

E.g. using #[wasm_bindgen] #[dtypei_attr] results in the dtypei macro being called two times for the same function. First time with the actual function code, the second time with the post-wasm_bindgen processing.

If order is reversed, then the dtypei macro is called with the processed code, once. We do not want this.

Further digging into the problem is needed & testing with multiple macros & various ordering.