syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"writeln!(f,"}]}
source_snippet:         writeln!(f, "    {:?} [shape = doublecircle]", self.start)?;
context_before:         writeln!(f, "digraph {{")?;
context_after:         writeln!(f, "    {:?} [shape = doublecircle]", self.accept)?;