syntax_data: {"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let block_start_state = self.cursor.get().clone();
context_before:         self.cursor.seek_to_block_start(block);
context_after:         self.write_row_with_full_state(w, "", "(on start)")?;