{"ast_node_type":"variable","tokens":[{"end":99,"kind":"keyword","start":0,"text":"if"}]}
        if let (Some(f), Some(o)) = (self.to_error_region(fr), self.to_error_region(outlived_fr)) {
        // Check if we can use one of the "nice region errors".
            let infer_err = self.infcx.err_ctxt();