cargo-msrv VS rfcs

What this tool say? https://github.com/foresterre/cargo-msrv

I'm working on cargo-marv.

Before getting overcome by despair, have a look at cargo-msrv -- this little gem of a tool figures it all out for you!

I'll be adding a 'minimal' output format to cargo-msrv for use in scripts. I'll also be updating the book, and inch closer towards releasing v0.16.

First commit 2 months ago, started with edition 2021. https://hg.sr.ht/~cyplo/legdur/browse/Cargo.toml?rev=ca11815...

Have you tried compiling something less than bleeding edge, with a year old compiler, or are you picking projects specifically to "showcase" the supposed failings of the Rust compiler?

Many libraries in the ecosystem have a MSRV (minimum support rust version) guarantee, with compile-time shims to enable newer features if a more recent version is detected.

You can pin your dependencies to those versions (and if they don't have an explicit MSRV, just pin it to a version by date or by running https://github.com/foresterre/cargo-msrv on the project to find the effective MSRV).

You can cargo install specific versions of a binary crate, and if they move to the 2021 edition, or use a recently stabilized standard library function or w/e, you can simply choose to install a specific version, that would work with your distro's rustc/cargo.

I'm not even talking about the completely valid, but last resort strategy of many non-bleeding edge distro package maintainers, of simply creating a .patch file and applying it. In legdur's case, --- edition = "2021" +++ edition = "2018" on Cargo.toml would probably do the trick. For libraries/binaries you control, you can use https://doc.rust-lang.org/cargo/reference/overriding-depende... and https://github.com/itmettkeDE/cargo-patch.

Giving up after the first minor roadblock and crying bloody murder is intellectually lazy.

Looks helpful though it doesn't seem to address when you don't have a Cargo.lock. I've created an issue for this.

I'll be switching over the CLI of cargo-msrv, from Clap's builder methods to the attribute macro. I hope this will simplify the configuration, as my Config and ConfigBuilder structs (which were build from Clap's ArgMatches) was growing fast, and becoming slightly unorganized. With the attribute macro, the config will be constructed directly by code generated by the macro. The mostly saves one intermediate step, and a lot of boilerplate.

Some combination of cargo-outdated and cargo-msrv could probably do this in a slightly more manual fashion.

RFC: Add large language models to Rust

https://github.com/rust-lang/rfcs/pull/3603

Man, SO and family has really gone downhill. That top answer is absolutely terrible. In fact, if you care, you can literally look at the RFC discussion here to see the actual debate: https://github.com/rust-lang/rfcs/pull/582

Basically, `for x in y` is kind of redundant, already sorta-kinda supported by itertools, and there's also a ton of macros that sorta-kinda do it already. It would just be language bloat at this point.

Literally has nothing to do with memory management.

Congrats!

> Similarly, uv does not yet generate a platform-agnostic lockfile. This matches pip-tools, but differs from Poetry and PDM, making uv a better fit for projects built around the pip and pip-tools workflows.

Do you expect to make the higher level workflow independent of requirements.txt / support a platform-agnostic lockfile? Being attached to Rye makes me think "no".

Without being platform agnostic, to me this is dead-on-arrival and unable to meet the "Cargo for Python" aim.

> uv supports alternate resolution strategies. By default, uv follows the standard Python dependency resolution strategy of preferring the latest compatible version of each package. But by passing --resolution=lowest, library authors can test their packages against the lowest-compatible version of their dependencies. (This is similar to Go's Minimal version selection.)

> uv allows for resolutions against arbitrary target Python versions. While pip and pip-tools always resolve against the currently-installed Python version (generating, e.g., a Python 3.12-compatible resolution when running under Python 3.12), uv accepts a --python-version parameter, enabling you to generate, e.g., Python 3.7-compatible resolutions even when running under newer versions.

This is great to see though!

I can understand it being a flag on these lower level, directly invoked dependency resolution operations.

While you aren't onto the higher level operations yet, I think it'd be useful to see if there is any cross-ecosystem learning we can do for my MSRV RFC: https://github.com/rust-lang/rfcs/pull/3537

How are you handling pre-releases in you resolution? Unsure how much of that is specified in PEPs. Its something that Cargo is weak in today but we're slowly improving.

In the early days of Rust there was a debate about whether to support "green threads" and in doing that require runtime support. It was actually implemented and included for a time but it creates problems when trying to do library or embedded code. At the time Go for example chose to go that route, and it was both nice (goroutines are nice to write and well supported) and expensive (effectively requires GC etc). I don't remember the details but there is a Rust RFC from when they removed green threads:

https://github.com/rust-lang/rfcs/blob/0806be4f282144cfcd55b...

I did some more digging. By RFC 899, I believe Alex Crichton meant PR 899 in this repo:

https://github.com/rust-lang/rfcs/pull/899

Still, no real discussion of why unbuffered stderr.

Rust has had a stable SIMD vector API[1] for a long time. But, it's architecture specific. The portable API[2] isn't stable yet, but you probably can't use the portable API for some of the more exotic uses of SIMD anyway. Indeed, that's true in .NET's case too[3].

Rust does all this SIMD too. It just isn't in the standard library. But the regex crate does it. Indeed, this is where .NET got its SIMD approach for multiple substring search from in the first place[4]. ;-)

You're right that Rust's standard library is conservatively vectorized though[5]. The main thing blocking this isn't the lack of SIMD availability. It's more about how the standard library is internally structured, and the fact that things like substring search are not actually defined in `std` directly, but rather, in `core`. There are plans to fix this[6].

[1]: https://doc.rust-lang.org/std/arch/index.html

[2]: https://doc.rust-lang.org/std/simd/index.html

[3]: https://github.com/dotnet/runtime/blob/72fae0073b35a404f03c3...

[4]: https://github.com/dotnet/runtime/pull/88394#issuecomment-16...

[5]: https://github.com/BurntSushi/memchr#why-is-the-standard-lib...

[6]: https://github.com/rust-lang/rfcs/pull/3469