Macro decomposing_normalize_to

macro_rules! decomposing_normalize_to {
    ($(#[$meta:meta])*,
     $normalize_to:ident,
     $write:path,
     $slice:ty,
     $prolog:block,
     $as_slice:ident,
     $fast:block,
     $text:ident,
     $sink:ident,
     $decomposition:ident,
     $decomposition_passthrough_bound:ident,
     $undecomposed_starter:ident,
     $pending_slice:ident,
     $outer:lifetime, // loop labels use lifetime tokens
    ) => { ... };
}