Function parse_punct

src/token.rs:5–15

(iter: Iter, ch: char)

use proc_macro::{Delimiter, Group, Ident, Literal, Span, TokenTree};

pub fn parse_punct(iter: Iter, ch: char) -> Result<()> {
    match iter.next() {
        Some(TokenTree::Punct(ref punct)) if punct.as_char() == ch => Ok(()),
        unexpected => {
            let span = unexpected
                .as_ref()
                .map_or_else(Span::call_site, TokenTree::span);
            Err(Error::new(span, format!("expected `{}`", ch)))
        }
    }
}

pub fn parse_optional_punct(iter: Iter, ch: char) -> Option<()> {
    match iter.peek() {