Revert "Remove spotlight usage"

This reverts commit 13c6d5819a.

src/libcore/future/future.rs

@@ -24,6 +24,7 @@ use crate::task::{Context, Poll};
 /// `.await` the value.
 ///
 /// [`Waker`]: ../task/struct.Waker.html
+#[doc(spotlight)]
 #[must_use = "futures do nothing unless you `.await` or poll them"]
 #[stable(feature = "futures_api", since = "1.36.0")]
 #[lang = "future_trait"]

src/libcore/iter/traits/iterator.rs

@@ -92,6 +92,7 @@ fn _assert_is_object_safe(_: &dyn Iterator<Item = ()>) {}
     label = "`{Self}` is not an iterator",
     message = "`{Self}` is not an iterator"
 )]
+#[doc(spotlight)]
 #[must_use = "iterators are lazy and do nothing unless consumed"]
 pub trait Iterator {
     /// The type of the elements being iterated over.

src/libcore/lib.rs

@@ -96,6 +96,7 @@
 #![feature(custom_inner_attributes)]
 #![feature(decl_macro)]
 #![feature(doc_cfg)]
+#![cfg_attr(not(bootstrap), feature(doc_spotlight))]
 #![feature(duration_consts_2)]
 #![feature(extern_types)]
 #![feature(fundamental)]

src/librustc_ast_passes/feature_gate.rs

@@ -253,6 +253,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
                     include => external_doc
                     cfg => doc_cfg
                     masked => doc_masked
+                    spotlight => doc_spotlight
                     alias => doc_alias
                     keyword => doc_keyword
                 );

src/librustc_span/symbol.rs

@@ -400,6 +400,7 @@ symbols! {
         doc_cfg,
         doc_keyword,
         doc_masked,
+        doc_spotlight,
         doctest,
         document_private_items,
         dotdot_in_tuple_patterns,
@@ -968,6 +969,7 @@ symbols! {
         soft,
         specialization,
         speed,
+        spotlight,
         sqrtf32,
         sqrtf64,
         sse4a_target_feature,

src/libstd/io/mod.rs

@@ -499,6 +499,7 @@ where
 /// [`&str`]: ../../std/primitive.str.html
 /// [slice]: ../../std/primitive.slice.html
 #[stable(feature = "rust1", since = "1.0.0")]
+#[doc(spotlight)]
 pub trait Read {
     /// Pull some bytes from this source into the specified buffer, returning
     /// how many bytes were read.
@@ -1261,6 +1262,7 @@ impl Initializer {
 ///
 /// [`write_all`]: #method.write_all
 #[stable(feature = "rust1", since = "1.0.0")]
+#[doc(spotlight)]
 pub trait Write {
     /// Write a buffer into this writer, returning how many bytes were written.
     ///

src/libstd/lib.rs

@@ -261,6 +261,7 @@
 #![feature(doc_cfg)]
 #![feature(doc_keyword)]
 #![feature(doc_masked)]
+#![cfg_attr(not(bootstrap), feature(doc_spotlight))]
 #![feature(dropck_eyepatch)]
 #![feature(duration_constants)]
 #![feature(exact_size_is_empty)]