syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:                     for arg in args.iter() {
context_before:                     print_indented!(self, "args: [", depth_lvl + 1);
context_after:                         self.print_expr(*arg, depth_lvl + 2);