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