No error on awaiting non-awaitable function

[ZoolWay]

TypeScript Version: 2.5.2

Code

class Test {
  public async test(): Promise<void> {
    await test2();
  }
  public test2(): boolean {
    console.info('test2');
    return true;
  }
}

Expected behavior:
Compiler warning or error that test2() is not awaitable because it does not return a Promise.

Actual behavior:
No warning or error, compiles unnecessarily into an awaiter wrapped function.

[kitsonk]

Did you mean await this.test2();?

Even still, duplicate of #8310.

Search is your friend.

[ZoolWay]

Did a search but guess I just included open issues.

Nevertheless, thanks! As this is intended for the reasons meantioned in #8310 I look into linting to avoid this error.