`posix-regex` dependency enforces nightly toolchain

[polarathene]

Just documenting this here as the only apparent blocker for building without nightly?:

$ RUSTFLAGS="-C link-arg=-nostartfiles" cargo build --target x86_64-unknown-linux-gnu --release

   Compiling posix-regex v0.1.1
   Compiling tz-rs v0.7.0
error[E0554]: `#![feature]` may not be used on the stable release channel
 --> /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/posix-regex-0.1.1/src/lib.rs:2:33
  |
2 | #![cfg_attr(feature = "no_std", feature(alloc))]
  |                                 ^^^^^^^^^^^^^^

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/posix-regex-0.1.1/src/lib.rs:4:1
  |
4 | #![feature(nll)]
  | ^^^^^^^^^^^^^^^^ help: remove the attribute
  |
  = help: the feature `nll` has been stable since `1.63.0` and no longer requires an attribute to enable

// src/main.rs
fn main() {
    println!("Hello, world!");
}

# Cargo.toml
[package]
name = "example"
version = "0.1.0"
edition = "2021"

[dependencies]
std = { version = "0.17.0", package = "eyra" }

---

c-scape dependency:

https://github.com/sunfishcode/c-ward/blob/aae71b8d3ce608a3ee3701b7646f345f1c649a27/c-scape/Cargo.toml#L39

posix-regex source for the feature(nll) line is here. The crate hasn't been updated for over 5 years though 🤷‍♂️

The other error for feature(alloc) looks like an attempt was to resolve it 4 years ago (October 2020), with the maintainer chiming in with a response over a year ago (March 2023) regarding resolving a conflict to push that forward. Gitlab being terrible for notifications in my experience the original contributor probably wasn't aware of that or has since moved on to other things.

---

No expectation for anyone to resolve this, just a tracking issue 👍

[bjorn3]

c-scape and c-gull both depend on some nightly features too. C-scape depends on c_variadics for defining ioctl and such. c_variadics is unlikely to be stabilized any time soon.

[sunfishcode]

Yes, c-scape and c-gull depend on several nightly-only features. I've now posted #145 to document this.

[sunfishcode]

To elaborate, setjmp etc. depend on naked_functions, pthread_setspecific etc. depend on thread_local, printf depends on c_variadic, malloc depends on linkage so that it can define weak symbols, and various bits of libc static memory use sync_unsafe_cell. In theory some of these things could be made optional, if there are specific use cases that would benefit.