36 lines
1.0 KiB
Rust
36 lines
1.0 KiB
Rust
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// no-prefer-dynamic
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#![crate_type = "proc-macro"]
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extern crate proc_macro;
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use proc_macro::TokenStream;
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#[proc_macro_attribute]
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pub fn nop_attr(_attr: TokenStream, input: TokenStream) -> TokenStream {
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assert!(_attr.to_string().is_empty());
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input
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}
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#[proc_macro_attribute]
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pub fn no_output(_attr: TokenStream, _input: TokenStream) -> TokenStream {
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assert!(_attr.to_string().is_empty());
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assert!(!_input.to_string().is_empty());
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"".parse().unwrap()
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}
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#[proc_macro]
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pub fn emit_input(input: TokenStream) -> TokenStream {
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input
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}
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