{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
                let stmt = self.mk_stmt(span, StmtKind::Expr(expr));
                // Replace `'label: non_block_expr` with `'label: {non_block_expr}` in order to suppress future errors about `break 'label`.
                let blk = self.mk_block(thin_vec![stmt], BlockCheckMode::Default, span);