{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
        let requires = if self.eat_keyword_noexpect(exp!(ContractRequires).kw) {
    ) -> PResult<'a, Option<rustc_ast::ptr::P<ast::FnContract>>> {
            self.psess.gated_spans.gate(sym::contracts_internals, self.prev_token.span);