8     let mut input = input.into_iter();  in fmt()
10     let first_opt = input.next();  in fmt()
11     let first_owned_str;  in fmt()
12     let mut names = BTreeSet::new();  in fmt()
13     let first_span = {  in fmt()
14         let Some((mut first_str, first_span)) = (match first_opt.as_ref() {  in fmt()
18                     let first = first.strip_prefix('"')?;  in fmt()
19                     let first = first.strip_suffix('"')?;  in fmt()
31         while let Some((_, rest)) = first_str.split_once('{') {  in fmt()
33             if let Some(rest) = first_str.strip_prefix('{') {  in fmt()
37             if let Some((name, rest)) = first_str.split_once('}') {  in fmt()
39                 let name = name.split_once(':').map_or(name, |(name, _)| name);  in fmt()
48     let adapter = quote_spanned!(first_span => ::kernel::fmt::Adapter);  in fmt()
50     let mut args = TokenStream::from_iter(first_opt);  in fmt()
52         let mut flush = |args: &mut TokenStream, current: &mut TokenStream| {  in fmt()
53             let current = std::mem::take(current);  in fmt()
55                 let (lhs, rhs) = (|| {  in fmt()
56                     let mut current = current.into_iter();  in fmt()
57                     let mut acc = TokenStream::new();  in fmt()
58                     while let Some(tt) = current.next() {  in fmt()
74         let mut current = TokenStream::new();  in fmt()
89         let name = Ident::new(name, first_span);  in fmt()