{"ast_node_type":"variable","tokens":[{"end":97,"kind":"keyword","start":0,"text":"let"}]}
                    let old_inside_assignment = mem::replace(&mut self.inside_assignment, false);
                    let pat_capture_span_stack = mem::take(&mut self.current_capture_span_stack);
                    let lhs_place = self.place_of_expr(expr);