//@ force-host //@ no-prefer-dynamic #![crate_type = "proc-macro"] extern crate proc_macro; use proc_macro::TokenStream; #[proc_macro_derive(A)] pub fn foo(input: TokenStream) -> TokenStream { input } #[proc_macro_derive(A)] //~ ERROR the name `A` is defined multiple times pub fn bar(input: TokenStream) -> TokenStream { input }