Parse -moz-image-rect() and -moz-element() only in Gecko

components/style/values/generics/image.rs

@@ -53,17 +53,24 @@ impl<I> ImageLayer<I> {
 pub enum GenericImage<Gradient, MozImageRect, ImageUrl> {
     /// A `<url()>` image.
     Url(ImageUrl),
+
     /// A `<gradient>` image.  Gradients are rather large, and not nearly as
     /// common as urls, so we box them here to keep the size of this enum sane.
     Gradient(Box<Gradient>),
+
     /// A `-moz-image-rect` image.  Also fairly large and rare.
+    // not cfg’ed out on non-Gecko to avoid `error[E0392]: parameter `MozImageRect` is never used`
+    // Instead we make MozImageRect an empty enum
     Rect(Box<MozImageRect>),
+
     /// A `-moz-element(# <element-id>)`
+    #[cfg(feature = "gecko")]
     #[css(function = "-moz-element")]
     Element(Atom),
+
     /// A paint worklet image.
     /// <https://drafts.css-houdini.org/css-paint-api/>
-    #[cfg(feature = "servo")]
+    #[cfg(feature = "servo-layout-2013")]
     PaintWorklet(PaintWorklet),
 }
 
@@ -323,8 +330,9 @@ where
             Image::Url(ref url) => url.to_css(dest),
             Image::Gradient(ref gradient) => gradient.to_css(dest),
             Image::Rect(ref rect) => rect.to_css(dest),
-            #[cfg(feature = "servo")]
+            #[cfg(feature = "servo-layout-2013")]
             Image::PaintWorklet(ref paint_worklet) => paint_worklet.to_css(dest),
+            #[cfg(feature = "gecko")]
             Image::Element(ref selector) => {
                 dest.write_str("-moz-element(#")?;
                 serialize_atom_identifier(selector, dest)?;