diff --git a/src/layout/ui.rs b/src/layout/ui.rs
index 0cb28cb..834c0ac 100644
--- a/src/layout/ui.rs
+++ b/src/layout/ui.rs
@@ -31,8 +31,12 @@ impl From<UI> for UIBuilder {
 }
 
 impl UIBuilder {
-    pub fn add<W: Widget>(&mut self, w: W) -> WidgetRef<W> {
-        WidgetRef::new(self.clone(), [self.push(w)])
+    pub fn add<W: Widget>(&mut self, w: impl WidgetLike<Widget = W>) -> WidgetRef<W> {
+        WidgetRef::new([w.add(self).erase_type()])
+    }
+
+    pub fn add_widget<W: Widget>(&mut self, w: W) -> WidgetRef<W> {
+        WidgetRef::new([self.push(w)])
     }
 
     pub fn push<W: Widget>(&mut self, w: W) -> WidgetId {
diff --git a/src/layout/widget.rs b/src/layout/widget.rs
index 9700dac..417b115 100644
--- a/src/layout/widget.rs
+++ b/src/layout/widget.rs
@@ -15,21 +15,19 @@ impl<W: Widget> Widget for (W,) {
     }
 }
 
+pub struct AnyWidget;
+
 #[derive(Eq, Hash, PartialEq, Debug)]
-pub struct WidgetId<W = ()> {
+pub struct WidgetId<W = AnyWidget> {
     pub(super) ty: TypeId,
     pub(super) id: ID,
     _pd: PhantomData<W>,
 }
 
 // TODO: temp
-impl Clone for WidgetId {
+impl<W> Clone for WidgetId<W> {
     fn clone(&self) -> Self {
-        Self {
-            ty: self.ty,
-            id: self.id.duplicate(),
-            _pd: self._pd,
-        }
+        Self::new(self.id.duplicate(), self.ty)
     }
 }
 
@@ -41,7 +39,7 @@ impl<W> WidgetId<W> {
             _pd: PhantomData,
         }
     }
-    pub fn erase_type(self) -> WidgetId<()> {
+    pub fn erase_type(self) -> WidgetId<AnyWidget> {
         self.cast_type()
     }
 
@@ -66,14 +64,14 @@ impl<W: Widget, F: FnOnce(&mut UIBuilder) -> W> WidgetLike for WidgetFn<F, W> {
     type Widget = W;
     fn add(self, ui: &mut UIBuilder) -> WidgetId<W> {
         let w = (self.0)(ui);
-        ui.add(w).to_id()
+        ui.add_widget(w).to_id()
     }
 }
 
 impl<W: Widget> WidgetLike for W {
     type Widget = W;
     fn add(self, ui: &mut UIBuilder) -> WidgetId<W> {
-        ui.add(self).to_id()
+        ui.add_widget(self).to_id()
     }
 }
 
@@ -93,15 +91,13 @@ impl<W> WidgetLike for WidgetArr<1, (W,)> {
 }
 
 pub struct WidgetArr<const LEN: usize, Ws> {
-    pub ui: UIBuilder,
-    pub arr: [WidgetId<()>; LEN],
+    pub arr: [WidgetId; LEN],
     _pd: PhantomData<Ws>,
 }
 
 impl<const LEN: usize, Ws> WidgetArr<LEN, Ws> {
-    pub fn new(ui: UIBuilder, arr: [WidgetId<()>; LEN]) -> Self {
+    pub fn new(arr: [WidgetId; LEN]) -> Self {
         Self {
-            ui,
             arr,
             _pd: PhantomData,
         }
@@ -138,12 +134,10 @@ macro_rules! impl_widget_arr {
     ($n:expr;$($T:tt)*) => {
         impl<$($T: WidgetLike,)*> WidgetArrLike<$n> for ($($T,)*) {
             type Ws = ($($T::Widget,)*);
-            #[allow(unused_variables)]
             fn ui(self, ui: &mut UIBuilder) -> WidgetArr<$n, ($($T::Widget,)*)> {
                 #[allow(non_snake_case)]
                 let ($($T,)*) = self;
                 WidgetArr::new(
-                    ui.clone(),
                     [$($T.add(ui).cast_type(),)*],
                 )
             }
diff --git a/src/lib.rs b/src/lib.rs
index c19b5bd..89d2b0e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,7 +3,6 @@
 #![feature(const_trait_impl)]
 #![feature(const_from)]
 #![feature(trait_alias)]
-#![feature(generic_const_exprs)]
 
 mod layout;
 mod render;
diff --git a/src/util/id.rs b/src/util/id.rs
index ad6fc08..cca6616 100644
--- a/src/util/id.rs
+++ b/src/util/id.rs
@@ -27,6 +27,7 @@ impl IDTracker {
         id
     }
 
+    #[allow(dead_code)]
     pub fn free(&mut self, id: ID) {
         self.free.push(id);
     }