Switch to using a minimum-supported Rust version (MSRV) (#35)

This makes it easier to contribute to the Rust portions of CPython if you have a newer version of Rust installed.

Author: Kivooeo

.github/setup-rust-windows/action.yml

@@ -11,9 +11,9 @@ inputs:
 runs:
   using: composite
   steps:
-    - uses: dtolnay/rust-toolchain@ab40b01f54fe82bdf65693ea090a1e4942c136e7 # 1.91.1
+    - uses: dtolnay/rust-toolchain@f133eefe930d61f0d9371efd474daf0125ed3dd1 # 1.95.0
       with:
-        toolchain: 1.91.1
+        toolchain: 1.95.0
         targets: i686-pc-windows-msvc,x86_64-pc-windows-msvc,aarch64-pc-windows-msvc
     # LIBCLANG_PATH must be set explicitly so the vcxproj uses the LLVM we
     # install here rather than the VS-bundled LLVM whose clang headers have

.github/workflows/build.yml

@@ -353,9 +353,9 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
-      - uses: dtolnay/rust-toolchain@ab40b01f54fe82bdf65693ea090a1e4942c136e7 # 1.91.1
+      - uses: dtolnay/rust-toolchain@f133eefe930d61f0d9371efd474daf0125ed3dd1 # 1.95.0
         with:
-          toolchain: 1.91.1
+          toolchain: 1.95.0
           targets: ${{ matrix.arch }}-linux-android
       - name: Build and test
         run: JAVA_HOME="${JAVA_HOME_21_X64:-$JAVA_HOME_21_arm64}" python3 Platforms/Android ci --fast-ci ${{ matrix.arch }}-linux-android
@@ -370,9 +370,9 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
-      - uses: dtolnay/rust-toolchain@ab40b01f54fe82bdf65693ea090a1e4942c136e7 # 1.91.1
+      - uses: dtolnay/rust-toolchain@f133eefe930d61f0d9371efd474daf0125ed3dd1 # 1.95.0
         with:
-          toolchain: 1.91.1
+          toolchain: 1.95.0
           targets: aarch64-apple-ios-sim
       # GitHub recommends explicitly selecting the desired Xcode version:
       # https://github.com/actions/runner-images/issues/12541#issuecomment-3083850140

.github/workflows/reusable-wasi.yml

@@ -47,9 +47,9 @@ jobs:
       uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
       with:
         python-version: '3.x'
-    - uses: dtolnay/rust-toolchain@ab40b01f54fe82bdf65693ea090a1e4942c136e7 # 1.91.1
+    - uses: dtolnay/rust-toolchain@f133eefe930d61f0d9371efd474daf0125ed3dd1 # 1.95.0
       with:
-        toolchain: 1.91.1
+        toolchain: 1.95.0
         targets: wasm32-wasip1
     - name: "Runner image version"
       run: echo "IMAGE_OS_VERSION=${ImageOS}-${ImageVersion}" >> "$GITHUB_ENV"

Cargo.toml

@@ -4,3 +4,7 @@ members = [
     "Modules/_base64", "Modules/cpython-build-helper", "Modules/cpython-rust-staticlib",
     "Modules/cpython-sys"
 ]
+
+[workspace.package]
+# Make sure to also update the Rust toolchains in GitHub Actions whenever this version is modified
+rust-version = "1.95"

Modules/_base64/Cargo.toml

@@ -2,6 +2,7 @@
 name = "_base64"
 version = "0.1.0"
 edition = "2024"
+rust-version.workspace = true
 
 [dependencies]
 cpython-sys ={ path = "../cpython-sys" }

Modules/cpython-build-helper/Cargo.toml

@@ -2,6 +2,7 @@
 name = "cpython-build-helper"
 version = "0.1.0"
 edition = "2024"
+rust-version.workspace = true
 
 [dependencies]
 shlex = "1.3"

Modules/cpython-rust-staticlib/Cargo.toml

@@ -2,6 +2,7 @@
 name = "cpython-rust-staticlib"
 version = "0.1.0"
 edition = "2024"
+rust-version.workspace = true
 
 [dependencies]
 _base64 ={ path = "../_base64" }

Modules/cpython-sys/Cargo.toml

@@ -2,6 +2,7 @@
 name = "cpython-sys"
 version = "0.1.0"
 edition = "2024"
+rust-version.workspace = true
 
 [dependencies]