syntax_data: {"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let start = self.inner_values_buffer.len();
context_before:     fn cache_preorder_invoke(&mut self, root: PlaceIndex) {
context_after:         if let Some(vi) = self.places[root].value_index {