Mr. Kuehne, your code does not work on my Linux box with DMD 0.149. Here is the output of compiler: /usr/src/phobos/std/gc.d(43): identifier 'GCStats' is not defined /usr/src/phobos/std/gc.d(43): GCStats is used as a type /usr/src/phobos/std/gc.d(43): cannot have parameter of type void Regards Dejan