{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"if"}]}
        if args[0].has_placeholders() || args[0].has_non_region_param() {
        let ty = || Ty::new_coroutine(self, def_id, args);
            return Err(self.layout_error(LayoutError::TooGeneric(ty())));