Looking at rbuffer, rgc, and the lltype namespaces, it's not completely clear to me how I would go about writing a struct with a resizable primitive array inlined.

Something like:

typedef struct foo_t {

int a, b;

int _data[0];

}

foo_t tmp = malloc(sizeof(foo_t) + 64);

I can see that the GC has the ability to allocate "extra" memory beyond what's required for a struct, and that lltype has the ability to inline some lists into a struct, but how does this work in practice? And maybe I'm missing something in the docs, so simply pointing me to some docs is also fine.

“One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.”
(Robert Firth)