{"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"lis.with(lockstep_iter_size("}]}
                lis.with(lockstep_iter_size(
            expr.for_each_metavar(LockstepIterSize::Unconstrained, |lis, ident| {
                    &TokenTree::MetaVar(ident.span, *ident),