On Saturday, 31 March 2018 at 20:17:26 UTC, Per Nordlöw wrote: >> auto reg = Region!(NullAllocator, 16)(cast(ubyte[])buf); > > Thanks! Turns out that Region allocator wasn't fully qualified: https://github.com/dlang/phobos/pull/6400 This will make it possible to allocate with it in pure code :)