[Clippy] Swap option_as_ref_deref to use diagnostic items instead of paths

Author: GnomedDev

alloc/src/ffi/c_str.rs

@@ -576,6 +576,7 @@ impl CString {
     #[inline]
     #[must_use]
     #[stable(feature = "as_c_str", since = "1.20.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "cstring_as_c_str")]
     pub fn as_c_str(&self) -> &CStr {
         &*self
     }

alloc/src/string.rs

@@ -1073,6 +1073,7 @@ impl String {
     #[inline]
     #[must_use]
     #[stable(feature = "string_as_str", since = "1.7.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "string_as_str")]
     pub fn as_str(&self) -> &str {
         self
     }
@@ -1092,6 +1093,7 @@ impl String {
     #[inline]
     #[must_use]
     #[stable(feature = "string_as_str", since = "1.7.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "string_as_mut_str")]
     pub fn as_mut_str(&mut self) -> &mut str {
         self
     }

alloc/src/vec/mod.rs

@@ -1545,6 +1545,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// ```
     #[inline]
     #[stable(feature = "vec_as_slice", since = "1.7.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "vec_as_slice")]
     pub fn as_slice(&self) -> &[T] {
         self
     }
@@ -1562,6 +1563,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// ```
     #[inline]
     #[stable(feature = "vec_as_slice", since = "1.7.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "vec_as_mut_slice")]
     pub fn as_mut_slice(&mut self) -> &mut [T] {
         self
     }

std/src/ffi/os_str.rs

@@ -196,6 +196,7 @@ impl OsString {
     /// let os_str = OsStr::new("foo");
     /// assert_eq!(os_string.as_os_str(), os_str);
     /// ```
+    #[cfg_attr(not(test), rustc_diagnostic_item = "os_string_as_os_str")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[must_use]
     #[inline]

std/src/path.rs

@@ -1226,6 +1226,7 @@ impl PathBuf {
     /// let p = PathBuf::from("/test");
     /// assert_eq!(Path::new("/test"), p.as_path());
     /// ```
+    #[cfg_attr(not(test), rustc_diagnostic_item = "pathbuf_as_path")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[must_use]
     #[inline]