syntax_data: {"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let name = graphviz_safe_def_name(self.body.source.def_id());
context_before:     fn graph_id(&self) -> dot::Id<'_> {
context_after:         dot::Id::new(format!("graph_for_def_id_{name}")).unwrap()