> A footgun is code that was written in a naive way, looks correct, submitted, and you find out after submitting it that it was erroneous.
You’re contradicting yourself a bit here I think. Erroneous code generally won’t compile whereas in Zig it will happily do so. Also, Zig has plenty of foot guns (eg forgetting to call defer on a deinit but even misusing noalias or having an out of bounds result in memory corruption). IMHO the zig footgun story with respect to UB behavior is largely unchanged relative to C/C++. It’s mildly better but it’s closer to C/C++ than being a safe language and UB is a huge ass footgun in any moderate complexity codebase.
> IMHO the zig footgun story with respect to UB behavior is largely unchanged relative to C/C++
The only major UB from C that zig doesn’t address is use after free afaik. How is that largely unchanged???
Just having an actual strong type system w/o the “billion dollar mistake” is a large change.
Depends how you compile it. If you’re compiling ReleaseFast/ReleaseSmall, it’s not very different from C (modulo as you said it has some language features to make it less likely you do it):
* Double free
* Out of bounds array access
* Dereferencing null pointers
* Misaligned pointer dereference
* Accessing uninitialized memory
* Signed integer overflow
* Accessing a union field for which the active tag is something else.
wow, what a list! all of these are statically analyzable using a slightly hacked zig compiler and a library!
https://github.com/ityonemo/clr
(Btw: you can't null pointer dereference in zig without using the navigation operator which will panic on null; you can't misalign a pointer unless you use @alignCast which will also create a panic)
Neat. Why isn’t this in the main compiler / will it be? I’m happy to retract my statement if this becomes actually how zig compiles but it’s not a serious thing as it’s more a PoC of what’s possible today and may break later
This is pretty close to saying Rust is not very different than C because it has the unsafe keyword. That is, either an ignorant (of Zig) or disingenuous statement.
To me the zig position is akin to saying that because Asan, TSAn and ubsan exist, c++ is safe because you’re just running optimized for performance.
If you believe I mischaracterized zig, please enlighten me what I got wrong specifically rather than attacking my ad hominem
I’m not going to write a detailed response to something that’s extremely close to what an LLM responds to “what UB does zig have?”
Arguing about whether certain static analysis should be opt in or opt out is just extremely uninteresting. It’s not like folks are auditing the unsafe blocks in their dependencies anyways.
If you want to talk about actual type system issues that’s more interesting.