{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
        let (leading_vert_span, mut trailing_vert) = match self.eat_or_separator(None) {
        // Allow a '|' before the pats (RFCs 1925, 2530, and 2535).
            EatOrResult::AteOr => (Some(self.prev_token.span), false),