Build on current nightly

core/src/primitive/color.rs

@@ -144,7 +144,7 @@ impl ColorNum for f32 {
 
 unsafe impl bytemuck::Pod for Color<u8> {}
 
-impl const F32Conversion for f32 {
+const impl F32Conversion for f32 {
     fn to(self) -> f32 {
         self
     }
@@ -153,7 +153,7 @@ impl const F32Conversion for f32 {
     }
 }
 
-impl const F32Conversion for u8 {
+const impl F32Conversion for u8 {
     fn to(self) -> f32 {
         self as f32 / 255.0
     }