41 lines
1.1 KiB
Rust
41 lines
1.1 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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#![feature(proc_macro)]
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extern crate proc_macro;
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use proc_macro::*;
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#[proc_macro]
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pub fn tokens(input: TokenStream) -> TokenStream {
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assert_nothing_joint(input);
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TokenStream::empty()
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}
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#[proc_macro_attribute]
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pub fn nothing(_: TokenStream, input: TokenStream) -> TokenStream {
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assert_nothing_joint(input);
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TokenStream::empty()
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}
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fn assert_nothing_joint(s: TokenStream) {
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for tt in s {
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match tt {
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TokenTree::Group(g) => assert_nothing_joint(g.stream()),
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TokenTree::Punct(p) => assert_eq!(p.spacing(), Spacing::Alone),
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_ => {}
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}
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}
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}
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