{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":")"}]}
    ) -> (&'hir hir::Generics<'hir>, hir::FnSig<'hir>) {
        attrs: &[hir::Attribute],
        let header = self.lower_fn_header(sig.header, hir::Safety::Safe, attrs);