On Mon, May 18, 2015 at 1:57 PM, via Digitalmars-d-announce <digitalmars-d-announce@puremagic.com> wrote:

void fibonacciSeries()

void fibonacciSeries(T)() if (isIntegral!T) {...}

unittest
{
import std.concurrency: yield, Generator;
auto series = new Generator!int(&fibonacciSeries);

auto series = new Generator!int(&fibonacciSeries!int);

import std.range: take;
writefln("%(%s, %)", series.take(10));
}

Surely you shouldn't have int in your fibonacci function?