Remove doc_cfg_hide feature

Author: GuillaumeGomez

alloc/src/lib.rs

@@ -207,7 +207,7 @@
 //
 // Rustdoc features:
 #![feature(doc_cfg)]
-#![feature(doc_cfg_hide)]
+#![cfg_attr(bootstrap, feature(doc_cfg_hide))]
 // Technically, this is a bug in rustdoc: rustdoc sees the documentation on `#[lang = slice_alloc]`
 // blocks is for `&[T]`, which also has documentation using this feature in `core`, and gets mad
 // that the feature-gate isn't enabled. Ideally, it wouldn't check for the feature gate for docs

core/src/lib.rs

@@ -161,6 +161,7 @@
 //
 // Language features:
 // tidy-alphabetical-start
+#![cfg_attr(bootstrap, feature(doc_cfg_hide))]
 #![feature(abi_unadjusted)]
 #![feature(adt_const_params)]
 #![feature(allow_internal_unsafe)]
@@ -176,7 +177,6 @@
 #![feature(deprecated_suggestion)]
 #![feature(derive_const)]
 #![feature(doc_cfg)]
-#![feature(doc_cfg_hide)]
 #![feature(doc_notable_trait)]
 #![feature(extern_types)]
 #![feature(f16)]

std/src/lib.rs

@@ -278,6 +278,8 @@
 // tidy-alphabetical-start
 
 // stabilization was reverted after it hit beta
+#![cfg_attr(bootstrap, feature(doc_cfg_hide))]
+#![cfg_attr(not(bootstrap), feature(autodiff))]
 #![feature(alloc_error_handler)]
 #![feature(allocator_internals)]
 #![feature(allow_internal_unsafe)]
@@ -293,7 +295,6 @@
 #![feature(decl_macro)]
 #![feature(deprecated_suggestion)]
 #![feature(doc_cfg)]
-#![feature(doc_cfg_hide)]
 #![feature(doc_masked)]
 #![feature(doc_notable_trait)]
 #![feature(dropck_eyepatch)]