5 fn concat(tokens: &[TokenTree], group_span: Span) -> TokenTree {  in concat()
6     let mut tokens = tokens.iter();  in concat()  localVariable
10         match tokens.next() {  in concat()
21                 let Some(TokenTree::Ident(ident)) = tokens.next() else {  in concat()
49 pub(crate) fn expand(tokens: &mut Vec<TokenTree>) {  in expand()
50     for token in tokens.iter_mut() {  in expand()
74     for i in (0..tokens.len().saturating_sub(3)).rev() {  in expand()
77             (&tokens[i + 1], &tokens[i + 2]),  in expand()
81             match &tokens[i + 3] {  in expand()
83                     tokens.splice(i + 3..i + 4, group.stream());  in expand()
88             match &tokens[i] {  in expand()
90                     tokens.splice(i..i + 1, group.stream());  in expand()