6     let mut tokens = tokens.iter();  in concat_helper()
7     let mut segments = Vec::new();  in concat_helper()
8     let mut span = None;  in concat_helper()
14                 let mut value = lit.to_string();  in concat_helper()
22                 let mut value = ident.to_string();  in concat_helper()
29                 let Some(TokenTree::Ident(ident)) = tokens.next() else {  in concat_helper()
33                 let (mut value, sp) = segments.pop().expect("expected identifier before modifier");  in concat_helper()
50                 let tokens = group.stream().into_iter().collect::<Vec<TokenTree>>();  in concat_helper()
61     let segments = concat_helper(tokens);  in concat()
62     let pasted: String = segments.into_iter().map(|x| x.0).collect();  in concat()
68         if let TokenTree::Group(group) = token {  in expand()
69             let delimiter = group.delimiter();  in expand()
70             let span = group.span();  in expand()
71             let mut stream: Vec<_> = group.stream().into_iter().collect();  in expand()
83                 let mut group = Group::new(delimiter, stream.into_iter().collect());  in expand()