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()
29                 let Some(TokenTree::Ident(ident)) = tokens.next() else {  in concat()
57 pub(crate) fn expand(tokens: &mut Vec<TokenTree>) {  in expand()
58     for token in tokens.iter_mut() {  in expand()
72                 // Recursively expand tokens inside the group  in expand()
82     for i in (0..tokens.len().saturating_sub(3)).rev() {  in expand()
85             (&tokens[i + 1], &tokens[i + 2]),  in expand()
89             match &tokens[i + 3] {  in expand()
91                     tokens.splice(i + 3..i + 4, group.stream());  in expand()
96             match &tokens[i] {  in expand()
98                     tokens.splice(i..i + 1, group.stream());  in expand()