import { type CannotBe } from "https://deno.land/x/deno_slack_sdk@2.14.2/test_utils.ts";
Checks whether T can never include U.
import { type CannotBe } from "https://deno.land/x/deno_slack_sdk@2.14.2/test_utils.ts";
Checks whether T can never include U.