Try fixing windows build

Author: phansch

.github/workflows/rust.yml

@@ -54,6 +54,9 @@ jobs:
     - name: Add rustc-dev component
       run: rustup component add rustc-dev
 
+    - name: Run tests
+      run: cargo +nightly build --features rustc
+
     - name: Run test-project tests with `rustc` feature
       run: cd test-project && cargo +nightly test --features rustc