lock nightly version

Author: cospectrum

.github/workflows/scheduled.yml

@@ -14,10 +14,21 @@ concurrency:
   cancel-in-progress: true
 name: rolling
 jobs:
+  vars:
+    runs-on: ubuntu-latest
+    # https://rust-lang.github.io/rustup-components-history/
+    outputs:
+      nightly: nightly-2025-10-21
+    steps:
+      - run: echo "dummy job"
   # https://twitter.com/mycoliza/status/1571295690063753218
   nightly:
+    needs: vars
     runs-on: ubuntu-latest
-    name: ubuntu / nightly
+    name: ubuntu / ${{ matrix.toolchain }}
+    strategy:
+      matrix:
+        toolchain: ["${{ needs.vars.outputs.nightly }}"]
     steps:
       - uses: actions/checkout@v4
         with:
@@ -36,8 +47,12 @@ jobs:
     # of this crate will generally use the latest available crates. This is subject to the standard
     # Cargo semver rules (i.e cargo does not update to a new major version unless explicitly told
     # to).
+    needs: vars
     runs-on: ubuntu-latest
-    name: ubuntu / nightly / updated
+    name: ubuntu / ${{ matrix.toolchain }} / updated
+    strategy:
+      matrix:
+        toolchain: ["${{ needs.vars.outputs.nightly }}"]
     # There's no point running this if no Cargo.lock was checked in in the first place, since we'd
     # just redo what happened in the regular test job. Unfortunately, hashFiles only works in if on
     # steps, so we repeat it.
@@ -47,7 +62,9 @@ jobs:
           submodules: true
       - name: Install nightly
         if: hashFiles('Cargo.lock') != ''
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.toolchain }}
       - name: cargo update
         if: hashFiles('Cargo.lock') != ''
         run: cargo update

.github/workflows/test.yml

@@ -16,12 +16,20 @@ concurrency:
   cancel-in-progress: true
 name: test
 jobs:
+  vars:
+    runs-on: ubuntu-latest
+    # https://rust-lang.github.io/rustup-components-history/
+    outputs:
+      nightly: nightly-2025-10-21
+    steps:
+      - run: echo "dummy job"
   required:
+    needs: vars
     runs-on: ubuntu-latest
     name: ubuntu / ${{ matrix.toolchain }}
     strategy:
       matrix:
-        toolchain: [nightly]
+        toolchain: ["${{ needs.vars.outputs.nightly }}"]
     steps:
       - uses: actions/checkout@v4
         with:
@@ -41,26 +49,34 @@ jobs:
       - name: cargo test --doc
         run: cargo test --locked --all-features --doc
   direct-minimal:
+    needs: vars
+    strategy:
+      matrix:
+        toolchain: ["${{ needs.vars.outputs.nightly }}"]
     runs-on: ubuntu-latest
-    name: ubuntu / nightly / direct-minimal-versions
+    name: ubuntu / ${{ matrix.toolchain }} / direct-minimal-versions
     steps:
       - uses: actions/checkout@v4
         with:
           submodules: true
-      - name: Install nightly
-        uses: dtolnay/rust-toolchain@nightly
+      - name: Install ${{ matrix.toolchain }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.toolchain }}
       - name: cargo update -Zdirect-minimal-versions
         run: cargo update -Zdirect-minimal-versions
       - name: cargo test
         run: cargo test --locked --all-features --all-targets
   os-check:
     # run cargo test on mac and windows
+    needs: vars
     runs-on: ${{ matrix.os }}
-    name: ${{ matrix.os }} / nightly
+    name: ${{ matrix.os }} / ${{ matrix.toolchain }}
     strategy:
       fail-fast: false
       matrix:
         os: [macos-latest, windows-latest]
+        toolchain: ["${{ vars.needs.outputs.nightly }}"]
     steps:
       # if your project needs OpenSSL, uncomment this to fix Windows builds.
       # it's commented out by default as the install command takes 5-10m.
@@ -71,8 +87,10 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: true
-      - name: Install nightly
-        uses: dtolnay/rust-toolchain@nightly
+      - name: Install ${{ matrix.toolchain }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolhain: ${{ matrix.toolchain }}
       - name: cargo generate-lockfile
         if: hashFiles('Cargo.lock') == ''
         run: cargo generate-lockfile