Update GH actions for supporting unstable features

.github/workflows/rust.yml

@@ -16,7 +16,7 @@ jobs:
         tool: cargo-hack,cargo-minimal-versions
     - run: rustup set profile minimal
     - run: rustup toolchain install ${{ matrix.tc }}
-    - run: cargo +${{ matrix.tc }} test --all --all-features
+    - run: cargo +${{ matrix.tc }} test --all
   test:
     runs-on: ${{ matrix.os }}
     strategy:
@@ -30,6 +30,20 @@ jobs:
         tool: cargo-hack,cargo-minimal-versions
     - run: rustup set profile minimal
     - run: rustup toolchain install ${{ matrix.tc }}
+    - run: cargo +${{ matrix.tc }} minimal-versions test --all
+  test-unstable-features:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        tc: [nightly]
+    steps:
+    - uses: taiki-e/checkout-action@v1
+    - uses: taiki-e/install-action@v2
+      with:
+        tool: cargo-hack,cargo-minimal-versions
+    - run: rustup set profile minimal
+    - run: rustup toolchain install ${{ matrix.tc }}
     - run: cargo +${{ matrix.tc }} minimal-versions test --all --all-features
   cross-compile:
     runs-on: ${{ matrix.os }}
@@ -53,7 +67,7 @@ jobs:
     - run: rustup set profile minimal
     - run: rustup toolchain install ${{ matrix.tc }}
     - run: rustup target add ${{ matrix.cc }} --toolchain ${{ matrix.tc }}
-    - run: cargo +${{ matrix.tc }} minimal-versions build --all --all-features --target=${{ matrix.cc }}
+    - run: cargo +${{ matrix.tc }} minimal-versions build --all --target=${{ matrix.cc }}
   cross-compile-ios:
     runs-on: ${{ matrix.os }}
     strategy:
@@ -69,4 +83,4 @@ jobs:
     - run: rustup set profile minimal
     - run: rustup toolchain install ${{ matrix.tc }}
     - run: rustup target add ${{ matrix.cc }} --toolchain ${{ matrix.tc }}
-    - run: cargo +${{ matrix.tc }} minimal-versions build --all --all-features --target=${{ matrix.cc }}
+    - run: cargo +${{ matrix.tc }} minimal-versions build --all --target=${{ matrix.cc }}