{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"($([$t1:"}]}
    ($([$t1: ty $(where $($generics1: tt)*)?])*) => {
macro_rules! impls_dyn_send_neg {
        $(impl$(<$($generics1)*>)? !DynSend for $t1 {})*