fix

.github/workflows/test.yml

@@ -27,6 +27,9 @@ jobs:
       - name: Setup Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@v1
 
+      - name: Install nightly toolchain
+        run: rustup toolchain install nightly
+
       - name: Cargo fmt
         run: cargo +nightly fmt --all -- --check