delegates that return void + lambdas

[Joshua Hodkinson via Digitalmars-d-learn]

So I have run across the following issue while working with 
delegates and lambdas,

---
struct Struct {
        int prop;
}

alias Func = void delegate(ref Struct);
Func func = (ref s) => s.prop += 1;
---

with compiler error `Error: cannot return non-void from function`

I understand that the lambda syntax in this case would be short 
for

---
Func func = (ref s) { return s.prop += 1; };
---

But does this mean you can't have lambdas that return void?

Thanks