{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"errors::OptionResultRefMismatch::Copied"}]}
                    errors::OptionResultRefMismatch::Copied { span, def_path }
                let subdiag = if self.type_is_copy_modulo_regions(self.param_env, ty) {
                } else if self.type_is_clone_modulo_regions(self.param_env, ty) {