{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"Some(UselessPtrNullChecksDiag::FnPtr"}]}
                Some(UselessPtrNullChecksDiag::FnPtr { orig_ty, label: e.span })
            return if orig_ty.is_fn() {
            } else if orig_ty.is_ref() {