syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:             for &id in args.iter() {
context_before:             let mut new_args = Vec::<ty::Const<'tcx>>::with_capacity(args.len());
context_after:                 new_args.push(recurse_build(tcx, body, id, root_span)?);