3 files changed, 5 insertions, 0 deletions
diff --git a/library/alloc/src/ffi/c_str.rs b/library/alloc/src/ffi/c_str.rs
index e32676a6543..45037aa1615 100644
--- a/library/alloc/src/ffi/c_str.rs
+++ b/library/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
     }
diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs
index 6daab5bc73a..a2c70de3ed0 100644
--- a/library/alloc/src/string.rs
+++ b/library/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
     }
diff --git a/library/alloc/src/vec/mod.rs b/library/alloc/src/vec/mod.rs
index 2afb5dd0d1a..ac0db38eac3 100644
--- a/library/alloc/src/vec/mod.rs
+++ b/library/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
     }