syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:         for ty in fru_info.field_types.iter() {
context_before:         print_indented!(self, "field_types: [", depth_lvl + 1);
context_after:             print_indented!(self, format!("ty: {:?}", ty), depth_lvl + 2);