Update CI.

.github/workflows/build.yml

@@ -10,8 +10,8 @@ jobs:
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install
@@ -24,28 +24,35 @@ jobs:
         python -mpip install .
     - name: Test
       run: |
-        pyver="$(python -c 'import sys; print("{0.major}.{0.minor}".format(sys.version_info))')" &&
-        COVERAGE_FILE=".coverage.$pyver" python -mpytest --cov --cov-branch
+        python -mpytest --cov --cov-branch
     - name: Upload coverage
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
-        name: coverage
+        name: coverage-${{ matrix.python-version }}
+        include-hidden-files: true
         path: .coverage.*
 
   coverage:
     runs-on: ubuntu-latest
     needs: build
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
       with:
-        python-version: "3.11"
-    - name: Download coverage
-      uses: actions/download-artifact@v3
-      with:
-        name: coverage
+        python-version: "3.12"
     - name: Coverage
       run: |
+        shopt -s globstar &&
+        GH_TOKEN=${{ secrets.GITHUB_TOKEN }} \
+          gh run download ${{ github.run-id }} -p 'coverage-*' &&
         python -mpip install --upgrade coverage &&
-        python -mcoverage combine .coverage.* &&  # Unifies paths across envs.
+        python -mcoverage combine coverage-* &&  # Unifies paths across envs.
+        python -mcoverage annotate &&
+        for f in **/*,cover; do
+          if ! grep -q '^!' "$f"; then
+            continue
+          fi
+          echo "$f" &&
+          grep -nTC2 '^!' "$f"
+        done &&
         python -mcoverage report --show-missing