{"ast_node_type":"variable","tokens":[{"end":23,"kind":"keyword","start":0,"text":"let"}]}
        let expr = self
        let try_branch = self.alloc_expr(try_branch.map_or(Expr::Missing, Expr::Path), syntax_ptr);
            .alloc_expr(Expr::Call { callee: try_branch, args: Box::new([operand]) }, syntax_ptr);