public static URL toUrl(URI uri) throws IOException {
   try {
     if ("file".equalsIgnoreCase(uri.getScheme()) && uri.getHost() != null) {
       throw new UnsupportedOperationException("Remote file URIs are not supported: " + uri);
     }
     return uri.toURL();
   } catch (Error e) {
     // best we can do for now
     // rely on caller to provide context, e.g., the requested module URI
     if (e.getClass().getName().equals("com.oracle.svm.core.jdk.UnsupportedFeatureError")) {
       throw new IOException("Unsupported protocol: " + uri.getScheme());
     }
     throw e;
   }
 }