And the first example still doesn't compile:
```
struct Range(R) {
import std.array : empty, front, popFront;
R range;
bool empty() const { return range.empty; }
auto front() const { return range.front; }
void popFront() { range.popFront(); }
}
void main() {
auto rng = Range!string("1234");
assert(rng.front == '1');
}
```
onlineapp.d(11): Error: void has no value
onlineapp.d(11): Error: incompatible types for (rng.front) ==
('1'): void and char
```
