Babele Dunnit skrev: > and why the leak does not shows up under OsX?? Because the GDC version of the GC (gcx.d) contains: version(GNU) memset(p + size, 0, binsize[bin] - size); where the DMD library contains the commented out: //foreach(inout byte b; cast(byte[])(p + size)[0..binsize[bin] - size]) { b = 0; } (It seems) /Oskar