Fast GC allocation of many small objects

[Per Nordlöw]

On Friday, 30 March 2018 at 20:38:35 UTC, rikki cattermole wrote:
> Use a custom allocator (that could be backed by the GC) using 
> std.experimental.allocators :)

https://dlang.org/phobos/std_experimental_allocator.html

is massive.

I guess I should allocate my nodes using

     auto node = theAllocator.make!StrNode("alpha");

Could someone please give a working example of a GC-backed 
`theAllocator` suitable for my allocation pattern?