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1 | // Copyright 2018 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 | // no-prefer-dynamic | |
12 | ||
13 | #![crate_type = "proc-macro"] | |
14 | #![feature(proc_macro)] | |
15 | ||
16 | extern crate proc_macro; | |
17 | ||
18 | use proc_macro::TokenStream; | |
19 | ||
20 | #[proc_macro_attribute] | |
21 | pub fn nop_attr(_attr: TokenStream, input: TokenStream) -> TokenStream { | |
22 | assert!(_attr.to_string().is_empty()); | |
23 | input | |
24 | } | |
25 | ||
26 | #[proc_macro_attribute] | |
27 | pub fn no_output(_attr: TokenStream, _input: TokenStream) -> TokenStream { | |
28 | assert!(_attr.to_string().is_empty()); | |
29 | assert!(!_input.to_string().is_empty()); | |
30 | "".parse().unwrap() | |
31 | } | |
32 | ||
33 | #[proc_macro] | |
34 | pub fn emit_input(input: TokenStream) -> TokenStream { | |
35 | input | |
36 | } |