As (Async)TestDelegate ,Action and Func<Task> do not return actual values, their only use is to executed under a Throw constraint so we can catch any exceptions.

Currently we allow Assert.That(() => {}, Is.Not.Null); and all other useless combinations.

We should only allow Assert.That(() => {}, Throws.Nothing)

Suitable modifiers should still be supported:

Assert.That(SomeMethod, Throws.ArgumentExeption.With.ParamName("arg"));
Assert.That(SomeMethod, Throws.Exeption<ArgumentException>().With(x => Assert.That(x.ParamName, Is.EqualTo("arg"))));
Assert.That(SomeMethod, Throws.Exeption<ArgumentException>().With(x => x.ParamName).EqualTo("arg"));