alt Hacker NewsNot really. I've worked with rust for 4 years, systems side, and never had to write a custom drop implementation. That's the gotcha here, not the rigamarole with the static+Send option type (which _would_ be something you'd encounter in prod).
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That's easily the exception rather than the rule. I've seen custom `Drop` implementations in almost every non-trivial Rust codebase I worked on.
A custom `Drop` appears very quickly with FFI code. Suppose for example you interface with some C library that expects you to call a function to release some resources.
Now we are at the phase where, Rust is “safe” but only if you use it “correctly” and without using X language feature or a custom Y feature.
This is the problem when a language advertises with “guarantees” and it turns out it never had any due to many false assumptions by their promoters.
So what other soundness bugs are there in the language that we need to know about?
I've written dozens of custom Drop implementations. Well, many of them are named cleanup because of the async Drop mess in Rust, but...