syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:             for var in value.bound_vars().iter() {
context_before:         let (new_value, map) = if self.should_print_verbose() {
context_after:                 start_or_continue(self, mode.start_str(), ", ");