src/test/compile-fail-fulldeps/proc-macro/signature.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 #![crate_type = "proc-macro"]
  12 #![feature(proc_macro)]
  13 #![allow(warnings)]
  14
  15 extern crate proc_macro;
  16
  17 #[proc_macro_derive(A)]
  18 unsafe extern fn foo(a: i32, b: u32) -> u32 {
  19     //~^ ERROR: mismatched types
  20     //~| NOTE: expected normal fn, found unsafe fn
  21     //~| NOTE: expected type `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
  22     //~| NOTE: found type `unsafe extern "C" fn(i32, u32) -> u32 {foo}`
  23     loop {}
  24 }