maps in set-nth()

src/builtin/list.rs

@@ -78,6 +78,7 @@ pub(crate) fn register(f: &mut HashMap<String, Builtin>) {
             max_args!(args, 3);
             let (mut list, sep) = match arg!(args, 0, "list") {
                 Value::List(v, sep, ..) => (v, sep),
+                Value::Map(m) => (m.entries(), ListSeparator::Comma),
                 v => (vec![v], ListSeparator::Space),
             };
             let n = match arg!(args, 1, "n") {

tests/list.rs

@@ -83,6 +83,11 @@ test!(
     "a {\n  color: set-nth((a, b, c), 1, e);\n}\n",
     "a {\n  color: e, b, c;\n}\n"
 );
+test!(
+    set_nth_map,
+    "a {\n  color: set-nth((c: d, e: f, g: h), 2, i);\n}\n",
+    "a {\n  color: c d, i, g h;\n}\n"
+);
 test!(
     append_space_separated,
     "a {\n  color: append(a b, c);\n}\n",