Add "Top-level statements"

Author: wherewhere

.github/workflows/build-and-publish.yml

@@ -61,4 +61,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@v5

src/syntax.grammar

@@ -1211,7 +1211,7 @@ fixedPtrDeclarator { identifier '=' expr }
 // Compilation unit
 
 compilationUnit {
-	externAliasDirective* usingDirective* /*globalAttrs?*/ namespaceMemberDecl*
+	externAliasDirective* usingDirective* /*globalAttrs?*/ block* namespaceMemberDecl*
 }