{CStr,OsStr,Path}::as_$1

library/core/src/ffi/c_str.rs

@@ -648,6 +648,17 @@ pub const fn to_str(&self) -> Result<&str, str::Utf8Error> {
     pub fn display(&self) -> impl fmt::Display {
         crate::bstr::ByteStr::from_bytes(self.to_bytes())
     }
+
+    /// Returns the same string as a string slice `&CStr`.
+    ///
+    /// This method is redundant when used directly on `&CStr`, but
+    /// it helps dereferencing other string-like types to string slices,
+    /// for example references to `Box<CStr>` or `Arc<CStr>`.
+    #[inline]
+    #[unstable(feature = "str_as_str", issue = "130366")]
+    pub const fn as_c_str(&self) -> &CStr {
+        self
+    }
 }
 
 #[stable(feature = "c_string_eq_c_str", since = "1.90.0")]

library/std/src/ffi/os_str.rs

@@ -1278,6 +1278,17 @@ pub fn eq_ignore_ascii_case<S: AsRef<OsStr>>(&self, other: S) -> bool {
     pub fn display(&self) -> Display<'_> {
         Display { os_str: self }
     }
+
+    /// Returns the same string as a string slice `&OsStr`.
+    ///
+    /// This method is redundant when used directly on `&OsStr`, but
+    /// it helps dereferencing other string-like types to string slices,
+    /// for example references to `Box<OsStr>` or `Arc<OsStr>`.
+    #[inline]
+    #[unstable(feature = "str_as_str", issue = "130366")]
+    pub const fn as_os_str(&self) -> &OsStr {
+        self
+    }
 }
 
 #[stable(feature = "box_from_os_str", since = "1.17.0")]

library/std/src/path.rs

@@ -3208,6 +3208,17 @@ pub fn display(&self) -> Display<'_> {
         Display { inner: self.inner.display() }
     }
 
+    /// Returns the same path as `&Path`.
+    ///
+    /// This method is redundant when used directly on `&Path`, but
+    /// it helps dereferencing other `PathBuf`-like types to `Path`s,
+    /// for example references to `Box<Path>` or `Arc<Path>`.
+    #[inline]
+    #[unstable(feature = "str_as_str", issue = "130366")]
+    pub const fn as_path(&self) -> &Path {
+        self
+    }
+
     /// Queries the file system to get information about a file, directory, etc.
     ///
     /// This function will traverse symbolic links to query information about the