Make diangostic item names consistent

library/core/src/convert/mod.rs

@@ -269,7 +269,7 @@ pub trait AsMut<T: ?Sized> {
 ///
 /// [`String`]: ../../std/string/struct.String.html
 /// [`Vec`]: ../../std/vec/struct.Vec.html
-#[rustc_diagnostic_item = "into_trait"]
+#[rustc_diagnostic_item = "Into"]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait Into<T>: Sized {
     /// Performs the conversion.
@@ -358,7 +358,7 @@ pub trait Into<T>: Sized {
 /// [`String`]: ../../std/string/struct.String.html
 /// [`from`]: From::from
 /// [book]: ../../book/ch09-00-error-handling.html
-#[rustc_diagnostic_item = "from_trait"]
+#[rustc_diagnostic_item = "From"]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_on_unimplemented(on(
     all(_Self = "&str", T = "std::string::String"),
@@ -385,7 +385,7 @@ pub trait From<T>: Sized {
 ///
 /// This suffers the same restrictions and reasoning as implementing
 /// [`Into`], see there for details.
-#[rustc_diagnostic_item = "try_into_trait"]
+#[rustc_diagnostic_item = "TryInto"]
 #[stable(feature = "try_from", since = "1.34.0")]
 pub trait TryInto<T>: Sized {
     /// The type returned in the event of a conversion error.
@@ -465,7 +465,7 @@ pub trait TryInto<T>: Sized {
 /// ```
 ///
 /// [`try_from`]: TryFrom::try_from
-#[rustc_diagnostic_item = "try_from_trait"]
+#[rustc_diagnostic_item = "TryFrom"]
 #[stable(feature = "try_from", since = "1.34.0")]
 pub trait TryFrom<T>: Sized {
     /// The type returned in the event of a conversion error.

library/core/src/fmt/mod.rs

@@ -617,7 +617,7 @@ impl Display for Arguments<'_> {
     label = "`{Self}` cannot be formatted using `{{:?}}` because it doesn't implement `{Debug}`"
 )]
 #[doc(alias = "{:?}")]
-#[rustc_diagnostic_item = "debug_trait"]
+#[rustc_diagnostic_item = "Debug"]
 #[cfg_attr(not(bootstrap), rustc_trivial_field_reads)]
 pub trait Debug {
     /// Formats the value using the given formatter.
@@ -710,7 +710,7 @@ pub use macros::Debug;
     note = "in format strings you may be able to use `{{:?}}` (or {{:#?}} for pretty-print) instead"
 )]
 #[doc(alias = "{}")]
-#[rustc_diagnostic_item = "display_trait"]
+#[rustc_diagnostic_item = "Display"]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait Display {
     /// Formats the value using the given formatter.
@@ -1003,7 +1003,7 @@ pub trait UpperHex {
 /// assert_eq!(&l_ptr[..2], "0x");
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_diagnostic_item = "pointer_trait"]
+#[rustc_diagnostic_item = "Pointer"]
 pub trait Pointer {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]

library/core/src/marker.rs

@@ -30,7 +30,7 @@ use crate::hash::Hasher;
 /// [arc]: ../../std/sync/struct.Arc.html
 /// [ub]: ../../reference/behavior-considered-undefined.html
 #[stable(feature = "rust1", since = "1.0.0")]
-#[cfg_attr(not(test), rustc_diagnostic_item = "send_trait")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "Send")]
 #[rustc_on_unimplemented(
     message = "`{Self}` cannot be sent between threads safely",
     label = "`{Self}` cannot be sent between threads safely"
@@ -459,7 +459,7 @@ pub macro Copy($item:item) {
 /// [transmute]: crate::mem::transmute
 /// [nomicon-send-and-sync]: ../../nomicon/send-and-sync.html
 #[stable(feature = "rust1", since = "1.0.0")]
-#[cfg_attr(not(test), rustc_diagnostic_item = "sync_trait")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "Sync")]
 #[lang = "sync"]
 #[rustc_on_unimplemented(
     message = "`{Self}` cannot be shared between threads safely",

library/core/src/option.rs

@@ -509,7 +509,7 @@ use crate::{
 
 /// The `Option` type. See [the module level documentation](self) for more.
 #[derive(Copy, PartialEq, PartialOrd, Eq, Ord, Debug, Hash)]
-#[rustc_diagnostic_item = "option_type"]
+#[rustc_diagnostic_item = "Option"]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum Option<T> {
     /// No value

library/core/src/result.rs

@@ -498,7 +498,7 @@ use crate::{convert, fmt, hint};
 /// See the [module documentation](self) for details.
 #[derive(Copy, PartialEq, PartialOrd, Eq, Ord, Debug, Hash)]
 #[must_use = "this `Result` may be an `Err` variant, which should be handled"]
-#[rustc_diagnostic_item = "result_type"]
+#[rustc_diagnostic_item = "Result"]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum Result<T, E> {
     /// Contains the success value