no-panic
hn-search
no-panic | hn-search | |
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12 | 1,627 | |
515 | 524 | |
- | 0.2% | |
4.2 | 2.9 | |
about 2 years ago | 6 months ago | |
Rust | TypeScript | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
no-panic
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no_panic causing errors in hello world?
I discovered a crate called no_panic that prevents a function from compiling, unless the compiler can proof that this function can't panic.
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Is there something like "super-safe" rust?
/u/dtolnay has a no-panic macro, I don't know its limitations but in older comments they note it pretty much has to be used in release mode, as there are lots of panic codepaths which get optimised out.
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Is Rust really safe? How to identify functions that can potentially cause panic
'Hacks' such as https://github.com/dtolnay/no-panic, https://crates.io/crates/no-panics-whatsoever that ensure any calls to panic handling will result in link errors. Not really reliable in terms of being able to abort instead, but a possible tool.
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US NGO Consumer Reports also reporting on C and C++ safety for product development.
nope. Unfortunately, no mainstream language has this yet. We need an Algebraic effects typesystem to do this properly. There are a few temporary band-aid solutions like https://github.com/dtolnay/no-panic
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Carefully exploring Rust as a Python developer
This kind of already exists in the form of #[no_panic] [1]?
> If the function does panic (or the compiler fails to prove that the function cannot panic), the program fails to compile with a linker error that identifies the function name.
1: https://github.com/dtolnay/no-panic
- What I like about rust
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LKML: Linus Torvalds: Re: [PATCH v9 12/27] rust: add `kernel` crate
I really think that Rust needs an official #[no_panic] macro that can validate these sort of things (like dtolnay’s crate, I’m not sure why it was archived)
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A pair of Linux kernel modules using Rust
Because it's convenient and familiar to most programmers. Not providing bounds-checked indexing makes some kinds of code very hard to write.
But note his problem also happens with integer division.
In Rust, a[x] on an array or vec is really a roughly a shortand for a.get(x).unwrap() (with a different error message)
Likewise, a / b on integers is a kind of a shortand for a.checked_div(b).unwrap()
The thing is, if the index ever is out of bounds, or if the denominator is zero, the program has a bug, 100% of time. And if you catch a bug using an assertion there is seldom anything better than interrupting the execution (the only thing I can think of is restarting the program or the subsystem). If you continue execution past a programming error, you may sometimes corrupt data structures or introduce bizarre, hard to debug situations.
Doing a pattern match on a.get(x) doesn't help because if it's ever None (and your program logic expects that x is in bounds) then you are kind of forced to bail.
The downside here is that we aren't catching this bug at compile time. And it's true that sometimes we can rewrite the program to not have an indexing operation, usually using iterators (eliding the bounds check will make the program run faster, too). But in general this is not possible, at least not without bringing formal methods. But that's what tests are for, to ensure the correctness of stuff type errors can't catch.
Now, there are some crates like https://github.com/dtolnay/no-panic or https://github.com/facebookexperimental/MIRAI that will check that your code is panic free. The first one is based on the fact that llvm optimizations can often remove dead code and thus remove the panic from a[x] or a / b - if it doesn't, then compilation fails. The second one employs formal methods to mathematically prove that there is no panic. I guess those techniques will eventually be ported to the kernel even if panics happen differently there (by hooking on the BUG mechanism or whatever)
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Redoing the runtime
Hmm, yeah as you mentioned, looks like a surprising amount of stuff is already done in the rust for the linux kernel project: https://github.com/Rust-for-Linux/linux/tree/rust/rust/. It's also MIT/Apache licensed, but I was expecting gpl, so I can actually use it. It's still a lot to trim down on, so might be easier to just build up as needed. Additionally I just saw /u/dtolnay's #[no_panic] attribute which at least makes it a compiler error if it's accidentally done.
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[PATCH 00/13] [RFC] Rust support
Obviously, in bare metal systems, in the kernel, etc, you always want to use the second style. In this patch series, the first type had been stubbed out to panic, but Linus doesn't want any chance of panicking, he wants it to be a compile time error if anyone tries to call these methods from within the kernel, for example by not providing the symbols and failing to link if someone did try to use them. There is already precedent for doing that in the Rust ecosystem, so it's planned to do that in this patch series, but the authors hadn't gotten to that yet.
hn-search
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Louis Rossmann: YouTube's Legal Team sent me a letter [video]
If you see a post that ought to have been moderated but hasn't been, the likeliest explanation is that we didn't see it. You can help by flagging it or emailing us at [email protected].
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
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An Oil Price-Fixing Conspiracy Caused 27% of All Inflation in 2021
Ok, but please don't post unsubstantive comments to Hacker News.
I understand the reason for repeating these sentiments—it's the same reason why they get upvoted to the top of threads*—but repetition of this kind is what we're most trying to avoid here.
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so...
https://news.ycombinator.com/newsguidelines.html
* I've marked this one off topic now.
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Validating app for manufacturers enhancing process reliability and efficiency
I was looking for it in the guidelines. There are a couple of conventions for postings. Consider a bit of prior examples: [https://hn.algolia.com/?q=show+hn]
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Show HN: Hacker Search – A semantic search engine for Hacker News
yeah there are only three stories coming up from the site search
https://hn.algolia.com/?q=postgres+clustering
only one is semanthically correct, the other pick up the wrong version of clustering (i.e. k-means instead of multi master writes)
but yeah if one doesn't test the hard cases, how does one know it preserves semantics :D
- Longevity of Recordable CDs, DVDs and Blu-Rays
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The Scientific Method Part 5: Illusions, Delusions, and Dreams
Like dismissing the work of Feyerabend or Wittgenstein without seemingly having read either:
https://hn.algolia.com/?dateRange=pastMonth&page=0&prefix=tr...
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Any Google Analytics Alternatives?
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
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Russian GRU was behind the attack in Vrbětice, NCOZ confirms
If it's not [flagged], there's no flagging and hence also no flagging ring. baybal2 has been banned on and off for years now https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
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Gary Killdall, creator of CP/M, wrote Pixar's original 3D renderer [pdf]
The submitted title was "Gary Killdall, creator of CP/M, wrote Pixar's original 3D renderer".
Submitters: If you want to say what you think is important about an article, that's fine, but do it by adding a comment to the thread. Then your view will be on a level playing field with everyone else's: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so...
(From https://news.ycombinator.com/newsguidelines.html: "Please use the original title, unless it is misleading or linkbait; don't editorialize.")
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Nearsightedness is at epidemic levels – and the problem begins in childhood
Vision therapy for myopia helps some people, but not everyone, likely due to genetic and neuroplasticity differences, https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu.... Nevertheless, many of the principles are useful for children whose eyes and brains are still developing.
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