syntax_data: {"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let state_on_unwind = this.cursor.get().clone();
context_before:                 self.write_row(w, "", "(on successful return)", |this, w, fmt| {
context_after:                     this.cursor.apply_custom_effect(|analysis, state| {