// force-host // no-prefer-dynamic #![crate_type = "proc-macro"] extern crate proc_macro; use proc_macro::TokenStream; #[proc_macro_derive(UnionTest)] pub fn derive(input: TokenStream) -> TokenStream { let input = input.to_string(); assert!(input.contains("#[repr(C)]")); assert!(input.contains("union Test {")); assert!(input.contains("a: u8,")); assert!(input.contains("}")); "".parse().unwrap() }