Unable to compile. Please advise.
```
c:\dev\D\81 - 90\c83_e_static_foreach_fibonacci\source\app.d(8):
Error: function declaration without return type. (Note that
constructors are always named `this`)
writeln(n);
^
c:\dev\D\81 - 90\c83_e_static_foreach_fibonacci\source\app.d(8):
Error: variable name expected after type `writeln(n)`, not `;`
writeln(n);
^
```
source/app.d
```
import std.stdio;
import std.range;
import std.algorithm;
static foreach (n; FibonacciSeries().take(10).filter!isEven)
{
writeln(n);
}
void main()
{
foreach (n; FibonacciSeries().take(10).filter!isEven) {
writeln(n);
}
}
bool isEven(int n) {
return n % 2 == 0;
}
struct FibonacciSeries
{
int current = 0;
int next = 1;
enum empty = false;
int front() const
{
return current;
}
void popFront()
{
const nextNext = current + next;
current = next;
next = nextNext;
}
FibonacciSeries save() const
{
return this;
}
}
```
