load_xml was returning a single term instead of a list of nodes

tests/scryer/issues.rs

@@ -20,6 +20,15 @@ fn issue2588_load_html() {
     load_module_test("tests-pl/issue2588.pl", "[element(html,[],[element(head,[],[element(title,[],[[H,e,l,l,o,!]])]),element(body,[],[])])]");
 }
 
+#[test]
+#[cfg_attr(miri, ignore = "unsupported operation when isolation is enabled")]
+fn issue3256_load_xml_returns_list() {
+    load_module_test(
+        "tests-pl/issue3256.pl",
+        "[element(foo,[],[element(bar,[],[[h,e,l,l,o]])])]",
+    );
+}
+
 #[test]
 #[cfg_attr(miri, ignore = "unsupported operation when isolation is enabled")]
 fn issue2949_load_html() {