[7e]

It’s undefined behavior. It will never be stable. Investigating every permutation of zero-utility undefined behavior in the universe is borderline insane. Will the author next investigate exactly how a 2002 Fiat becomes inoperable after a head on collision with a 2025 Volkswagen? These are all deep dives into infinite chaos.

[rectang]

I agree that we shouldn't mix allocators, and so does the post's author. Can you put your technical arguments into terms which aren't so dismissive of people's honest efforts to learn? We ought to be all on the same page. You could affirm and refine the post's conclusions and bring us together, rather than ridicule someone for ever entertaining a notion you consider "insane".

Here's what I got when I asked ChatGPT to rewrite your first comment to be as constructive as possible:

"Totally agree — relying on C and Rust to interoperate at the allocator level is risky at best. Allocating in C and freeing in Rust (or vice versa) assumes a level of compatibility that just isn’t guaranteed. Even within a single ecosystem, allocator behavior can change across versions — whether it’s different versions of libc or updates to Rust’s std. So expecting consistent behavior across language boundaries is, at the very least, unreliable. If you need to free a C-allocated pointer, the safest and cleanest approach is to call back into C to do it."

That's not a drop-in substitute for your original comment and "totally agree" is over-the-top cloying in the usual ChatGPT obsequious way, but I still think it's helpful in suggesting alternative framings.