| // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| extern crate proc_macro; |
| |
| #[proc_macro_derive(Foo)] |
| //~^ ERROR: only usable with crates of the `proc-macro` crate type |
| pub fn foo(a: proc_macro::TokenStream) -> proc_macro::TokenStream { |
| a |
| } |
| |
| // Issue #37590 |
| #[proc_macro_derive(Foo)] |
| //~^ ERROR: the `#[proc_macro_derive]` attribute may only be used on bare functions |
| pub struct Foo { |
| } |
| |
| fn main() {} |
