BuildableType<"$_builder.getType<::mlrt::compiler::PromiseType>()"> {
  let description = [{
    `!mlrt.promise type` represents a C++ mlrt::Promise.
  }];
}

def MlrtAsyncHandleType : DialectType<Mlrt_Dialect,
    CPred<"$_self.isa<::mlrt::compiler::AsyncHandleType>()">, "!mlrt.async_handle type">,
    BuildableType<"$_builder.getType<::mlrt::compiler::AsyncHandleType>()"> {
  let description = [{