Why async / await allows for implicit conversion from a List to IEnumerable?

Question

I\'ve just been playing around with async/await and found out something interesting. Take a look at the examples below:

// 1) ok - obvious
public Task

        

Answer 1

Just think about your types. Task is not variant, so it's not convertible to Task, even if T : U.

However, if t is Task, then the type of await t is T, and T can be converted to U if T : U.