rust/src/test/ui/proc-macro/macro-namespace-reserved.rs

// Copyright 2018 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.

// no-prefer-dynamic

#![feature(decl_macro)]
#![crate_type = "proc-macro"]

extern crate proc_macro;
use proc_macro::*;

#[proc_macro]
pub fn my_macro(input: TokenStream) -> TokenStream {
    input
}

#[proc_macro_attribute]
pub fn my_macro_attr(input: TokenStream, _: TokenStream) -> TokenStream {
    input
}

#[proc_macro_derive(MyTrait)]
pub fn my_macro_derive(input: TokenStream) -> TokenStream {
    input
}

macro my_macro() {} //~ ERROR the name `my_macro` is defined multiple times
macro my_macro_attr() {} //~ ERROR the name `my_macro_attr` is defined multiple times
macro MyTrait() {} //~ ERROR the name `MyTrait` is defined multiple times

#[proc_macro_derive(SameName)]
pub fn foo(input: TokenStream) -> TokenStream {
    input
}

#[proc_macro]
pub fn SameName(input: TokenStream) -> TokenStream {
//~^ ERROR the name `SameName` is defined multiple times
    input
}