Remove `AttributeLintKind::DocAutoCfgHideShowUnexpectedItem` variant

compiler/rustc_attr_parsing/src/attributes/doc.rs

diff --git a/compiler/rustc_attr_parsing/src/attributes/doc.rs b/compiler/rustc_attr_parsing/src/attributes/doc.rs
index 665c516c..572093b 100644
--- a/compiler/rustc_attr_parsing/src/attributes/doc.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/doc.rs
@@ -13,7 +13,10 @@
 use super::prelude::{ALL_TARGETS, AllowedTargets};
 use super::{AcceptMapping, AttributeParser};
 use crate::context::{AcceptContext, FinalizeContext, Stage};
-use crate::errors::{DocAliasDuplicated, DocAutoCfgExpectsHideOrShow, IllFormedAttributeInput};
+use crate::errors::{
+    DocAliasDuplicated, DocAutoCfgExpectsHideOrShow, DocAutoCfgHideShowUnexpectedItem,
+    IllFormedAttributeInput,
+};
 use crate::parser::{ArgParser, MetaItemOrLitParser, MetaItemParser, OwnedPathParser};
 use crate::session_diagnostics::{
     DocAliasBadChar, DocAliasEmpty, DocAliasMalformed, DocAliasStartEnd, DocAttrNotCrateLevel,
@@ -376,9 +379,12 @@ fn parse_auto_cfg<S: Stage>(
 
                     for item in list.mixed() {
                         let MetaItemOrLitParser::MetaItemParser(sub_item) = item else {
-                            cx.emit_lint(
+                            cx.emit_dyn_lint(
                                 rustc_session::lint::builtin::INVALID_DOC_ATTRIBUTES,
-                                AttributeLintKind::DocAutoCfgHideShowUnexpectedItem { attr_name },
+                                move |dcx, level| {
+                                    DocAutoCfgHideShowUnexpectedItem { attr_name }
+                                        .into_diag(dcx, level)
+                                },
                                 item.span(),
                             );
                             continue;
@@ -416,10 +422,11 @@ fn parse_auto_cfg<S: Stage>(
                                 }
                             }
                             _ => {
-                                cx.emit_lint(
+                                cx.emit_dyn_lint(
                                     rustc_session::lint::builtin::INVALID_DOC_ATTRIBUTES,
-                                    AttributeLintKind::DocAutoCfgHideShowUnexpectedItem {
-                                        attr_name,
+                                    move |dcx, level| {
+                                        DocAutoCfgHideShowUnexpectedItem { attr_name }
+                                            .into_diag(dcx, level)
                                     },
                                     sub_item.span(),
                                 );

compiler/rustc_attr_parsing/src/errors.rs

diff --git a/compiler/rustc_attr_parsing/src/errors.rs b/compiler/rustc_attr_parsing/src/errors.rs
index 24cff14..18cc59a 100644
--- a/compiler/rustc_attr_parsing/src/errors.rs
+++ b/compiler/rustc_attr_parsing/src/errors.rs
@@ -181,3 +181,9 @@ pub(crate) struct DocAliasDuplicated {
 #[derive(Diagnostic)]
 #[diag("there exists a built-in attribute with the same name")]
 pub(crate) struct AmbiguousDeriveHelpers;
+
+#[derive(Diagnostic)]
+#[diag("`#![doc(auto_cfg({$attr_name}(...)))]` only accepts identifiers or key/value items")]
+pub(crate) struct DocAutoCfgHideShowUnexpectedItem {
+    pub attr_name: Symbol,
+}

compiler/rustc_lint/src/early/diagnostics.rs

diff --git a/compiler/rustc_lint/src/early/diagnostics.rs b/compiler/rustc_lint/src/early/diagnostics.rs
index 24ddef1..43f185f 100644
--- a/compiler/rustc_lint/src/early/diagnostics.rs
+++ b/compiler/rustc_lint/src/early/diagnostics.rs
@@ -43,10 +43,6 @@ fn into_diag(self, dcx: DiagCtxtHandle<'a>, level: Level) -> Diag<'a, ()> {
                     .into_diag(dcx, level)
             }
 
-            &AttributeLintKind::DocAutoCfgHideShowUnexpectedItem { attr_name } => {
-                lints::DocAutoCfgHideShowUnexpectedItem { attr_name }.into_diag(dcx, level)
-            }
-
             &AttributeLintKind::DocAutoCfgHideShowExpectsList { attr_name } => {
                 lints::DocAutoCfgHideShowExpectsList { attr_name }.into_diag(dcx, level)
             }

compiler/rustc_lint/src/lints.rs

diff --git a/compiler/rustc_lint/src/lints.rs b/compiler/rustc_lint/src/lints.rs
index 93f3210..3698976 100644
--- a/compiler/rustc_lint/src/lints.rs
+++ b/compiler/rustc_lint/src/lints.rs
@@ -3304,12 +3304,6 @@ fn add_to_diag<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>) {
 pub(crate) struct ExpectedNameValue;
 
 #[derive(Diagnostic)]
-#[diag("`#![doc(auto_cfg({$attr_name}(...)))]` only accepts identifiers or key/value items")]
-pub(crate) struct DocAutoCfgHideShowUnexpectedItem {
-    pub attr_name: Symbol,
-}
-
-#[derive(Diagnostic)]
 #[diag("`#![doc(auto_cfg({$attr_name}(...)))]` expects a list of items")]
 pub(crate) struct DocAutoCfgHideShowExpectsList {
     pub attr_name: Symbol,

compiler/rustc_lint_defs/src/lib.rs

diff --git a/compiler/rustc_lint_defs/src/lib.rs b/compiler/rustc_lint_defs/src/lib.rs
index 24991ac..466b9ac 100644
--- a/compiler/rustc_lint_defs/src/lib.rs
+++ b/compiler/rustc_lint_defs/src/lib.rs
@@ -656,7 +656,6 @@ pub enum DeprecatedSinceKind {
 pub enum AttributeLintKind {
     UnexpectedCfgName((Symbol, Span), Option<(Symbol, Span)>),
     UnexpectedCfgValue((Symbol, Span), Option<(Symbol, Span)>),
-    DocAutoCfgHideShowUnexpectedItem { attr_name: Symbol },
     DocAutoCfgHideShowExpectsList { attr_name: Symbol },
     DocInvalid,
     DocUnknownInclude { span: Span, inner: &'static str, value: Symbol },