{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"//"}]}
        // prepend "Mir_" to the graphviz_safe_def_name(def_id)
        // FIXME(richkadel): If/when migrating the MIR graphviz to this generic implementation,
        writeln!(w, "{} {}{} {{", kind, cluster, self.graphviz_name)?;