5 files changed, 10 insertions, 0 deletions
diff --git a/library/std/src/fs.rs b/library/std/src/fs.rs
index 73cce35ac59..c44223a2f32 100644
--- a/library/std/src/fs.rs
+++ b/library/std/src/fs.rs
@@ -184,6 +184,7 @@ pub struct DirEntry(fs_imp::DirEntry);
 /// ```
 #[derive(Clone, Debug)]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "FsOpenOptions")]
 pub struct OpenOptions(fs_imp::OpenOptions);
 
 /// Representation of the various timestamps on a file.
@@ -201,6 +202,7 @@ pub struct FileTimes(fs_imp::FileTimes);
 /// [`PermissionsExt`]: crate::os::unix::fs::PermissionsExt
 #[derive(Clone, PartialEq, Eq, Debug)]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "FsPermissions")]
 pub struct Permissions(fs_imp::FilePermissions);
 
 /// A structure representing a type of file with accessors for each file type.
@@ -2241,6 +2243,7 @@ pub fn canonicalize<P: AsRef<Path>>(path: P) -> io::Result<PathBuf> {
 /// ```
 #[doc(alias = "mkdir")]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "fs_create_dir")]
 pub fn create_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
     DirBuilder::new().create(path.as_ref())
 }
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index 604b795cd52..c93bf020252 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -1830,6 +1830,7 @@ pub trait Write {
 /// }
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "IoSeek")]
 pub trait Seek {
     /// Seek to an offset, in bytes, in a stream.
     ///
@@ -2893,6 +2894,7 @@ impl<B: BufRead> Iterator for Split<B> {
 /// [`lines`]: BufRead::lines
 #[stable(feature = "rust1", since = "1.0.0")]
 #[derive(Debug)]
+#[cfg_attr(not(test), rustc_diagnostic_item = "IoLines")]
 pub struct Lines<B> {
     buf: B,
 }
diff --git a/library/std/src/io/stdio.rs b/library/std/src/io/stdio.rs
index 9098d36ee53..05b21eeb40f 100644
--- a/library/std/src/io/stdio.rs
+++ b/library/std/src/io/stdio.rs
@@ -611,6 +611,7 @@ static STDOUT: OnceLock<ReentrantMutex<RefCell<LineWriter<StdoutRaw>>>> = OnceLo
 /// ```
 #[must_use]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "io_stdout")]
 pub fn stdout() -> Stdout {
     Stdout {
         inner: STDOUT
@@ -847,6 +848,7 @@ pub struct StderrLock<'a> {
 /// ```
 #[must_use]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "io_stderr")]
 pub fn stderr() -> Stderr {
     // Note that unlike `stdout()` we don't use `at_exit` here to register a
     // destructor. Stderr is not buffered, so there's no need to run a
diff --git a/library/std/src/process.rs b/library/std/src/process.rs
index e4ab1c17d96..e148635f581 100644
--- a/library/std/src/process.rs
+++ b/library/std/src/process.rs
@@ -526,6 +526,7 @@ impl fmt::Debug for ChildStderr {
 /// list_dir.status().expect("process failed to execute");
 /// ```
 #[stable(feature = "process", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "Command")]
 pub struct Command {
     inner: imp::Command,
 }
@@ -2196,6 +2197,7 @@ impl Child {
 /// process::exit(0x0100);
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "process_exit")]
 pub fn exit(code: i32) -> ! {
     crate::rt::cleanup();
     crate::sys::os::exit(code)
diff --git a/library/std/src/time.rs b/library/std/src/time.rs
index 005d8c76704..90ac0098dec 100644
--- a/library/std/src/time.rs
+++ b/library/std/src/time.rs
@@ -153,6 +153,7 @@ pub use core::time::TryFromFloatSecsError;
 ///
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[stable(feature = "time2", since = "1.8.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "Instant")]
 pub struct Instant(time::Instant);
 
 /// A measurement of the system clock, useful for talking to