Comment by Ygg2

> To be fair, although LLVM has several pretty annoying bugs which result in miscompiling Rust (and C, and any other language capable of expressing the same ideas) and it sure would be nice if they fixed them, there are also Rust bugs that live in the Rust compiler itself and aren't LLVM's responsibility.

Sure. Again, I didn't say there are no bugs in Rust codebase ever, or that Rust will prevent all of errors forever.

They are working on them, but a large chunk ~50% (45 out of 103) are either nightly-only bugs (due to nightly-only features) or LLVM bugs that are difficult to coordinate/solve.

Some part of them will probably be helped or solved by a new trait resolver, Polonius. Granted, this still won't resolve all issues. Or even all trait related issues.

> There are some scary soundness holes in Rust's compiler that will get patched eventually but in principle you could trip them today.

In principle, yes. In principle you should cower in a corner, because there are many scary things in the world. From microbes, to insects, to malevolent proteins, to meteors, to gamma rays, to strangelets, to rogue black holes, to gravity entering a new stable state.

In practice, you don't. Because in practice we empirically adjust our expectations to the phenomena that occur, or have occurred. So a war is very likely, but being vaporized by a stray cosmic ray is not very likely.

And most of those UB require either strange code or a weird combination of hardware, compilers, or flags. It's probably why most people don't encounter UB in everyday Rust.