{"ast_node_type":"function","tokens":[{"end":83,"kind":"keyword","start":0,"text":"fn"}]}
    fn reject_params_or_return(&self, abi: ExternAbi, ident: &Ident, sig: &FnSig) {
        let mut spans: Vec<_> = sig.decl.inputs.iter().map(|p| p.span).collect();