WIP: fix CI failure

Author: aykevl

.github/workflows/test.yml

@@ -18,8 +18,10 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+      - name: install Clang
+        run: brew install llvm@15
       - name: Run tests
-        run: make test CLANG=$(brew --prefix llvm)/bin/clang
+        run: make test CLANG=$(brew --prefix llvm@15)/bin/clang
   Test-Windows:
     runs-on: windows-latest
     steps: