src/test/compile-fail-fulldeps/proc-macro/illegal-proc-macro-derive-use.rs

   1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![feature(proc_macro)]
  12
  13 extern crate proc_macro;
  14
  15 #[proc_macro_derive(Foo)]
  16 //~^ ERROR: only usable with crates of the `proc-macro` crate type
  17 pub fn foo(a: proc_macro::TokenStream) -> proc_macro::TokenStream {
  18     a
  19 }
  20
  21 // Issue #37590
  22 #[proc_macro_derive(Foo)]
  23 //~^ ERROR: the `#[proc_macro_derive]` attribute may only be used on bare functions
  24 pub struct Foo {
  25 }
  26
  27 fn main() {}