diff --git a/src/base/mod.rs b/src/base/mod.rs
index 0577fac..ed22164 100644
--- a/src/base/mod.rs
+++ b/src/base/mod.rs
@@ -2,7 +2,8 @@ use std::ops::Range;
 
 use crate::{
     primitive::{Axis, Painter, RoundedRectData, UIRegion},
-    UIColor, Widget, WidgetArrLike, WidgetFn, WidgetId, WidgetLike,
+    ToId, UIColor, Widget, WidgetArrLike, WidgetFn, WidgetId, WidgetIdLikeTuple, WidgetLike,
+    WidgetLikeTuple,
 };
 
 #[derive(Clone, Copy)]
@@ -134,9 +135,12 @@ pub trait WidgetArrUtil<const LEN: usize> {
     fn span(self, axis: Axis, ratios: [impl UINum; LEN]) -> impl WidgetLike<Widget = Span>;
 }
 
-impl<const LEN: usize, Wa: WidgetArrLike<LEN>> WidgetArrUtil<LEN> for Wa {
+impl<const LEN: usize, Wa: WidgetArrLike<LEN>> WidgetArrUtil<LEN> for Wa
+where
+    <Wa::Ws as WidgetLikeTuple<LEN>>::Wrap<ToId>: WidgetIdLikeTuple<LEN>,
+{
     fn span(self, axis: Axis, ratios: [impl UINum; LEN]) -> impl WidgetLike<Widget = Span> {
-        WidgetFn(move |ui| Span::proportioned(axis, ratios, self.ui(ui).arr))
+        WidgetFn(move |ui| Span::proportioned(axis, ratios, self.ui(ui).erase_types()))
     }
 }
 
diff --git a/src/layout/ui.rs b/src/layout/ui.rs
index 0cb28cb..60c91c0 100644
--- a/src/layout/ui.rs
+++ b/src/layout/ui.rs
@@ -32,10 +32,10 @@ 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)])
+        WidgetRef::new(self.clone(), (self.push(w),))
     }
 
-    pub fn push<W: Widget>(&mut self, w: W) -> WidgetId {
+    pub fn push<W: Widget>(&mut self, w: W) -> WidgetId<W> {
         let mut ui = self.ui.borrow_mut();
         let id = ui.ids.next();
         ui.widgets.insert(id.duplicate(), w);
diff --git a/src/layout/widget.rs b/src/layout/widget.rs
index 9700dac..4bd2e68 100644
--- a/src/layout/widget.rs
+++ b/src/layout/widget.rs
@@ -3,7 +3,11 @@ use std::{
     marker::PhantomData,
 };
 
-use crate::{primitive::Painter, util::ID, UIBuilder};
+use crate::{
+    primitive::Painter,
+    util::{impl_tuple, ID},
+    UIBuilder,
+};
 
 pub trait Widget: 'static + Any {
     fn draw(&self, painter: &mut Painter);
@@ -23,7 +27,7 @@ pub struct WidgetId<W = ()> {
 }
 
 // TODO: temp
-impl Clone for WidgetId {
+impl<W: Widget> Clone for WidgetId<W> {
     fn clone(&self) -> Self {
         Self {
             ty: self.ty,
@@ -55,7 +59,7 @@ impl<W> WidgetId<W> {
 }
 
 pub trait WidgetLike {
-    type Widget;
+    type Widget: Widget;
     fn add(self, ui: &mut UIBuilder) -> WidgetId<Self::Widget>;
 }
 
@@ -77,89 +81,98 @@ impl<W: Widget> WidgetLike for W {
     }
 }
 
-impl<W> WidgetLike for WidgetId<W> {
+impl<W: Widget> WidgetLike for WidgetId<W> {
     type Widget = W;
     fn add(self, _: &mut UIBuilder) -> WidgetId<W> {
         self
     }
 }
 
-impl<W> WidgetLike for WidgetArr<1, (W,)> {
+impl<W: Widget> WidgetLike for WidgetArr<1, (W,)> {
     type Widget = W;
     fn add(self, _: &mut UIBuilder) -> WidgetId<W> {
-        let [id] = self.arr;
-        id.cast_type()
+        self.arr.0
     }
 }
 
-pub struct WidgetArr<const LEN: usize, Ws> {
+pub struct WidgetArr<const LEN: usize, Ws: WidgetLikeTuple<LEN>> {
     pub ui: UIBuilder,
-    pub arr: [WidgetId<()>; LEN],
-    _pd: PhantomData<Ws>,
+    pub arr: Ws::Wrap<ToId>,
 }
 
-impl<const LEN: usize, Ws> WidgetArr<LEN, Ws> {
-    pub fn new(ui: UIBuilder, arr: [WidgetId<()>; LEN]) -> Self {
-        Self {
-            ui,
-            arr,
-            _pd: PhantomData,
-        }
+impl<const LEN: usize, Ws: WidgetLikeTuple<LEN>> WidgetArr<LEN, Ws>
+where
+    Ws::Wrap<ToId>: WidgetIdLikeTuple<LEN>,
+{
+    pub fn new(ui: UIBuilder, arr: Ws::Wrap<ToId>) -> Self {
+        Self { ui, arr }
+    }
+    pub fn erase_types(self) -> [WidgetId; LEN] {
+        self.arr.map::<EraseId>(&mut ())
     }
 }
 
 pub type WidgetRef<W> = WidgetArr<1, (W,)>;
 
-impl<W> WidgetRef<W> {
-    pub fn handle(&self) -> WidgetId<W> {
-        let [id] = &self.arr;
-        id.clone().cast_type()
+impl<W: WidgetLike> WidgetRef<W> {
+    pub fn handle(&self) -> WidgetId<W::Widget> {
+        self.arr.0.clone()
     }
-    pub fn to_id(self) -> WidgetId<W> {
-        let [id] = self.arr;
-        id.cast_type()
+    pub fn to_id(self) -> WidgetId<W::Widget> {
+        self.arr.0
     }
 }
 
 pub trait WidgetArrLike<const LEN: usize> {
-    type Ws;
+    type Ws: WidgetLikeTuple<LEN>;
     fn ui(self, ui: &mut UIBuilder) -> WidgetArr<LEN, Self::Ws>;
 }
 
-impl<const LEN: usize, Ws> WidgetArrLike<LEN> for WidgetArr<LEN, Ws> {
+impl<const LEN: usize, Ws: WidgetLikeTuple<LEN>> WidgetArrLike<LEN> for WidgetArr<LEN, Ws> {
     type Ws = Ws;
     fn ui(self, _: &mut UIBuilder) -> WidgetArr<LEN, Ws> {
         self
     }
 }
 
-// I hate this language it's so bad why do I even use it
-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(),)*],
-                )
-            }
-        }
-    };
+impl_tuple!(Widget);
+impl_tuple!(WidgetLike);
+impl_tuple!(WidgetIdLike);
+
+pub trait WidgetIdLike {
+    fn erase_type(self) -> WidgetId;
 }
 
-impl_widget_arr!(1;A);
-impl_widget_arr!(2;A B);
-impl_widget_arr!(3;A B C);
-impl_widget_arr!(4;A B C D);
-impl_widget_arr!(5;A B C D E);
-impl_widget_arr!(6;A B C D E F);
-impl_widget_arr!(7;A B C D E F G);
-impl_widget_arr!(8;A B C D E F G H);
-impl_widget_arr!(9;A B C D E F G H I);
-impl_widget_arr!(10;A B C D E F G H I J);
-impl_widget_arr!(11;A B C D E F G H I J K);
-impl_widget_arr!(12;A B C D E F G H I J K L);
+impl<W> WidgetIdLike for WidgetId<W> {
+    fn erase_type(self) -> WidgetId {
+        self.erase_type()
+    }
+}
+
+pub struct ToId;
+impl WidgetLikeWrapper for ToId {
+    type Wrap<T: WidgetLike> = WidgetId<T::Widget>;
+    type Ctx = UIBuilder;
+    fn wrap<T: WidgetLike>(t: T, ctx: &mut Self::Ctx) -> Self::Wrap<T> {
+        t.add(ctx)
+    }
+}
+
+struct EraseId;
+impl WidgetIdLikeMapper for EraseId {
+    type Map = WidgetId<()>;
+    type Ctx = ();
+    fn map<Id: WidgetIdLike>(t: Id, _: &mut Self::Ctx) -> Self::Map {
+        t.erase_type()
+    }
+}
+
+impl<T: WidgetLikeTuple<LEN>, const LEN: usize> WidgetArrLike<LEN> for T
+where
+    T::Wrap<ToId>: WidgetIdLikeTuple<LEN>,
+{
+    type Ws = T;
+    fn ui(self, ui: &mut UIBuilder) -> WidgetArr<LEN, T> {
+        WidgetArr::new(ui.clone(), self.wrap::<ToId>(ui))
+    }
+}
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..21edefa 100644
--- a/src/util/id.rs
+++ b/src/util/id.rs
@@ -27,6 +27,8 @@ impl IDTracker {
         id
     }
 
+    // TODO: use this
+    #[allow(dead_code)]
     pub fn free(&mut self, id: ID) {
         self.free.push(id);
     }
diff --git a/src/util/mod.rs b/src/util/mod.rs
index 3e76920..7b64d17 100644
--- a/src/util/mod.rs
+++ b/src/util/mod.rs
@@ -1,3 +1,5 @@
 mod id;
+mod tuple;
 
 pub use id::*;
+pub use tuple::*;
diff --git a/src/util/tuple.rs b/src/util/tuple.rs
new file mode 100644
index 0000000..cde279f
--- /dev/null
+++ b/src/util/tuple.rs
@@ -0,0 +1,54 @@
+macro_rules! impl_tuple {
+    ($Tuple:ident $Bound:ident $Wrapper:ident $Mapper:ident $n:expr;$TL:tt $($T:tt)*) => {
+        #[allow(non_snake_case)]
+        impl<$($T: $Bound,)* $TL: $Bound> $Tuple<$n> for ($($T,)* $TL,) {
+            type Wrap<W: $Wrapper> = ($(W::Wrap<$T>,)* W::Wrap<$TL>,);
+            type Map<M: $Mapper> = [M::Map; $n];
+            fn wrap<W: $Wrapper>(self, ctx: &mut W::Ctx) -> ($(W::Wrap<$T>,)* W::Wrap<$TL>,) {
+                let ($($T,)* $TL,) = self;
+                ($(W::wrap($T, ctx),)* W::wrap($TL, ctx),)
+            }
+            fn map<M: $Mapper>(self, ctx: &mut M::Ctx) -> [M::Map; $n] {
+                let ($($T,)* $TL,) = self;
+                [$(M::map($T, ctx),)* M::map($TL, ctx)]
+            }
+        }
+    };
+    ($Tuple:ident, $Bound:ident, $Wrapper:ident, $Mapper:ident) => {
+        pub trait $Wrapper {
+            type Wrap<T: $Bound>;
+            type Ctx;
+            fn wrap<T: $Bound>(t: T, ctx: &mut Self::Ctx) -> Self::Wrap<T>;
+        }
+
+        pub trait $Mapper {
+            type Map;
+            type Ctx;
+            fn map<T: $Bound>(t: T, ctx: &mut Self::Ctx) -> Self::Map;
+        }
+
+        pub trait $Tuple<const LEN: usize> {
+            type Wrap<W: $Wrapper>;
+            type Map<M: $Mapper>;
+            fn map<M: $Mapper>(self, ctx: &mut M::Ctx) -> [M::Map; LEN];
+            fn wrap<W: $Wrapper>(self, ctx: &mut W::Ctx) -> Self::Wrap<W>;
+        }
+
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 1;A);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 2;A B);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 3;A B C);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 4;A B C D);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 5;A B C D E);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 6;A B C D E F);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 7;A B C D E F G);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 8;A B C D E F G H);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 9;A B C D E F G H I);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 10;A B C D E F G H I J);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 11;A B C D E F G H I J K);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 12;A B C D E F G H I J K L);
+    };
+    ($Bound:ident) => {
+        impl_tuple!(${concat($Bound, Tuple)}, $Bound, ${concat($Bound, Wrapper)}, ${concat($Bound, Mapper)});
+    }
+}
+pub(crate) use impl_tuple;