chore: satisfy clippy::owned_cow

Author: ErichDonGubler

moz-webgpu-cts/src/wpt/metadata.rs

@@ -870,7 +870,7 @@ where
             use std::borrow::Cow;
 
             #[derive(Clone, Debug, Default, Eq, PartialEq)]
-            struct TagsDisplay<'a>(Cow<'a, Vec<String>>);
+            struct TagsDisplay<'a>(Cow<'a, [String]>);
 
             impl Display for TagsDisplay<'_> {
                 fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
@@ -879,7 +879,7 @@ where
                 }
             }
 
-            let tags_ref = tags.as_ref();
+            let tags_ref = tags.as_deref();
             let tags_ref = tags_ref.map(Cow::Borrowed).map(TagsDisplay);
 
             write_normalized(f, &indent, TAGS_IDENT, tags_ref)?;

moz-webgpu-cts/src/wpt/metadata/properties.rs

@@ -2,7 +2,7 @@ use std::{
     collections::BTreeMap,
     fmt::{self, Debug, Display, Formatter},
     num::NonZeroUsize,
-    ops::{BitOr, BitOrAssign, Index, IndexMut},
+    ops::{BitOr, BitOrAssign, Deref, Index, IndexMut},
 };
 
 use enum_map::EnumMap;
@@ -301,9 +301,12 @@ impl<T> ExpandedPropertyValue<T> {
         inner
     }
 
-    pub(crate) fn as_ref(&self) -> ExpandedPropertyValue<&T> {
+    pub(crate) fn as_deref(&self) -> ExpandedPropertyValue<&<T as Deref>::Target>
+    where
+        T: Deref,
+    {
         ExpandedPropertyValue::from_query(|platform, build_profile| {
-            &self[(platform, build_profile)]
+            &*self[(platform, build_profile)]
         })
     }
 }