Migrate Rust code to latest stable toolchain

- Remove unstable feature flags (#![feature(step_trait)] and #![feature(trait_alias)])
- Remove Step trait bound from LinkType (required for stable Rust - Step is still unstable)
- Update Rust edition from 2018 to 2021
- Update rust-toolchain.toml from nightly-2022-08-22 to stable
- Update num-traits dependency from 0.2.14 to 0.2.19
- Set minimum Rust version (MSRV) to 1.70
- Update CI workflow to use dtolnay/rust-toolchain@stable

BREAKING CHANGE: LinkType trait no longer requires Step bound. This is
necessary because std::iter::Step remains unstable (rust-lang/rust#42168).

Fixes #125

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: konard

.github/workflows/rust.yml

@@ -54,9 +54,8 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@master
+        uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: nightly-2022-08-22
           components: rustfmt
 
       - name: Setup Node.js
@@ -94,9 +93,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: nightly-2022-08-22
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Cache cargo registry
         uses: actions/cache@v4
@@ -120,9 +117,8 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@master
+        uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: nightly-2022-08-22
           components: llvm-tools-preview
 
       - name: Cache cargo registry
@@ -157,9 +153,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: nightly-2022-08-22
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Cache cargo registry
         uses: actions/cache@v4
@@ -227,9 +221,7 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: nightly-2022-08-22
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -314,9 +306,7 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: nightly-2022-08-22
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Setup Node.js
         uses: actions/setup-node@v4

changelog.d/20251228_053006_migrate_to_stable_rust.md

@@ -0,0 +1,16 @@
+---
+bump: minor
+---
+
+### Changed
+- Migrated from nightly Rust (nightly-2022-08-22) to stable Rust toolchain
+- Updated Rust edition from 2018 to 2021
+- Updated `num-traits` dependency from 0.2.14 to 0.2.19
+- Set minimum Rust version (MSRV) to 1.70
+
+### Removed
+- **BREAKING**: Removed `Step` trait bound from `LinkType` trait
+  - The `std::iter::Step` trait remains unstable in Rust (tracking issue #42168)
+  - Types implementing `LinkType` no longer need to implement `Step`
+  - This is required for stable Rust compatibility
+- Removed `#![feature(step_trait)]` and `#![feature(trait_alias)]` feature flags

rust/Cargo.lock

@@ -1,7 +1,8 @@
 [package]
 name = "platform-num"
-version = "0.1.0"
-edition = "2018"
+version = "0.2.0"
+edition = "2021"
+rust-version = "1.70"
 authors = ["uselesssgoddess", "Linksplatform Team <[email protected]>"]
 license = "LGPL-3.0"
 repository = "https://github.com/linksplatform/Numbers"
@@ -18,7 +19,7 @@ name = "platform_num"
 path = "src/lib.rs"
 
 [dependencies]
-num-traits = "0.2.14"
+num-traits = "0.2.19"
 
 [profile.release]
 lto = true

rust/Cargo.toml

@@ -1,2 +1,3 @@
 [toolchain]
-channel = "nightly-2022-08-22"
+channel = "stable"
+components = ["rustfmt"]

rust/rust-toolchain.toml

@@ -1,6 +1,5 @@
 use std::fmt::{Debug, Display};
 use std::hash::Hash;
-use std::iter::Step;
 
 use num_traits::{AsPrimitive, FromPrimitive, PrimInt, Signed, ToPrimitive, Unsigned};
 
@@ -74,7 +73,6 @@ max_value_impl!(usize);
 pub trait LinkType:
 Num
 + Unsigned
-+ Step
 + ToSigned
 + MaxValue
 + FromPrimitive
@@ -89,7 +87,6 @@ Num
 impl<
     All: Num
     + Unsigned
-    + Step
     + ToSigned
     + MaxValue
     + FromPrimitive

rust/src/imp.rs

@@ -1,6 +1,3 @@
-#![feature(step_trait)]
-#![feature(trait_alias)]
-
 mod imp;
 
 pub use imp::{LinkType, MaxValue, Num, SignNum, ToSigned};