Implement AsRef<OsStr> for Cow<'_, Path>

thaliaarchi · thaliaarchi · commit 6e253cda4d03 · 2025-04-05T18:59:54.000-07:00
In #331751, `impl AsRef&lt;Path&gt; for Cow&lt;'_, OsStr&gt;` was added, but the
converse was omitted and it wasn't mentioned in discussion. This seems
to have been a simple oversight, as it otherwise implemented traits
mutually between `OsStr` and `Path`.
diff --git a/library/std/src/path.rs b/library/std/src/path.rs
@@ -3173,6 +3173,14 @@ impl AsRef<OsStr> for Path {
     }
 }
 
+#[stable(feature = "cow_path_as_ref_os_str", since = "CURRENT_RUSTC_VERSION")]
+impl AsRef<OsStr> for Cow<'_, Path> {
+    #[inline]
+    fn as_ref(&self) -> &OsStr {
+        self.as_os_str()
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl fmt::Debug for Path {
     fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {

Original file line number	Diff line number	Diff line change
`@@ -3173,6 +3173,14 @@ impl AsRef<OsStr> for Path {`
`3173`	`3173`	`}`
`3174`	`3174`	`}`
`3175`	`3175`
	`3176`	`+#[stable(feature = "cow_path_as_ref_os_str", since = "CURRENT_RUSTC_VERSION")]`
	`3177`	`+impl AsRef<OsStr> for Cow<'_, Path> {`
	`3178`	`+ #[inline]`
	`3179`	`+ fn as_ref(&self) -> &OsStr {`
	`3180`	`+ self.as_os_str()`
	`3181`	`+ }`
	`3182`	`+}`
	`3183`	`+`
`3176`	`3184`	`#[stable(feature = "rust1", since = "1.0.0")]`
`3177`	`3185`	`impl fmt::Debug for Path {`
`3178`	`3186`	`fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {`