Rollup merge of rust-lang#137214 - cyrgani:clippy_diagnostic_items, r=compiler-errors

add last std diagnostic items for clippy

Part of rust-lang/rust-clippy#5393.
Add diagnostic item attributes to the items in `std` and `core` where clippy currently uses hardcoded paths (https://github.com/rust-lang/rust-clippy/blob/master/clippy_utils/src/paths.rs).

Author: Urgau

Diff for: core/src/char/methods.rs

@@ -1168,6 +1168,7 @@ impl char {
     #[must_use]
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
     #[rustc_const_stable(feature = "const_char_is_ascii", since = "1.32.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "char_is_ascii")]
     #[inline]
     pub const fn is_ascii(&self) -> bool {
         *self as u32 <= 0x7F

Diff for: std/src/io/stdio.rs

@@ -239,6 +239,7 @@ fn handle_ebadf_lazy<T>(r: io::Result<T>, default: impl FnOnce() -> T) -> io::Re
 /// }
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "Stdin")]
 pub struct Stdin {
     inner: &'static Mutex<BufReader<StdinRaw>>,
 }

Diff for: std/src/panic.rs

@@ -255,6 +255,7 @@ pub use crate::panicking::{set_hook, take_hook};
 #[stable(feature = "panic_any", since = "1.51.0")]
 #[inline]
 #[track_caller]
+#[cfg_attr(not(test), rustc_diagnostic_item = "panic_any")]
 pub fn panic_any<M: 'static + Any + Send>(msg: M) -> ! {
     crate::panicking::begin_panic(msg);
 }

Diff for: std/src/process.rs

@@ -217,6 +217,7 @@ use crate::{fmt, fs, str};
 ///
 /// [`wait`]: Child::wait
 #[stable(feature = "process", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "Child")]
 pub struct Child {
     pub(crate) handle: imp::Process,
 
@@ -2115,6 +2116,7 @@ impl Child {
     /// [`ErrorKind`]: io::ErrorKind
     /// [`InvalidInput`]: io::ErrorKind::InvalidInput
     #[stable(feature = "process", since = "1.0.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "child_kill")]
     pub fn kill(&mut self) -> io::Result<()> {
         self.handle.kill()
     }
@@ -2135,6 +2137,7 @@ impl Child {
     /// ```
     #[must_use]
     #[stable(feature = "process_id", since = "1.3.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "child_id")]
     pub fn id(&self) -> u32 {
         self.handle.id()
     }
@@ -2375,6 +2378,7 @@ pub fn exit(code: i32) -> ! {
 /// [panic hook]: crate::panic::set_hook
 #[stable(feature = "process_abort", since = "1.17.0")]
 #[cold]
+#[cfg_attr(not(test), rustc_diagnostic_item = "process_abort")]
 pub fn abort() -> ! {
     crate::sys::abort_internal();
 }