Stabilize doc_alias feature

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -260,7 +260,6 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
                     cfg => doc_cfg
                     masked => doc_masked
                     spotlight => doc_spotlight
-                    alias => doc_alias
                     keyword => doc_keyword
                 );
             }

compiler/rustc_feature/src/accepted.rs

@@ -268,6 +268,8 @@ declare_features! (
     /// Allows `#[track_caller]` to be used which provides
     /// accurate caller location reporting during panic (RFC 2091).
     (accepted, track_caller, "1.46.0", Some(47809), None),
+    /// Allows `#[doc(alias = "...")]`.
+    (accepted, doc_alias, "1.48.0", Some(50146), None),
 
     // -------------------------------------------------------------------------
     // feature-group-end: accepted features

compiler/rustc_feature/src/active.rs

@@ -404,9 +404,6 @@ declare_features! (
     /// Allows dereferencing raw pointers during const eval.
     (active, const_raw_ptr_deref, "1.27.0", Some(51911), None),
 
-    /// Allows `#[doc(alias = "...")]`.
-    (active, doc_alias, "1.27.0", Some(50146), None),
-
     /// Allows inconsistent bounds in where clauses.
     (active, trivial_bounds, "1.28.0", Some(48214), None),
 

library/core/src/lib.rs

@@ -131,7 +131,7 @@
 #![feature(untagged_unions)]
 #![feature(unwind_attributes)]
 #![feature(variant_count)]
-#![feature(doc_alias)]
+#![cfg_attr(bootstrap, feature(doc_alias))]
 #![feature(mmx_target_feature)]
 #![feature(tbm_target_feature)]
 #![feature(sse4a_target_feature)]

library/std/src/lib.rs

@@ -245,7 +245,7 @@
 #![feature(core_intrinsics)]
 #![feature(custom_test_frameworks)]
 #![feature(decl_macro)]
-#![feature(doc_alias)]
+#![cfg_attr(bootstrap, feature(doc_alias))]
 #![feature(doc_cfg)]
 #![feature(doc_keyword)]
 #![feature(doc_masked)]

src/doc/rustdoc/src/advanced-features.md

@@ -32,3 +32,17 @@ pub struct UnixToken;
 
 Here, the respective tokens can only be used by dependent crates on their respective platforms, but
 they will both appear in documentation.
+
+## Add aliases for an item in documentation search
+
+This feature allows you to add alias(es) to an item when using the `rustdoc` search through the
+`doc(alias)` attribute. Example:
+
+```rust,no_run
+#[doc(alias = "x")]
+#[doc(alias = "big")]
+pub struct BigX;
+```
+
+Then, when looking for it through the `rustdoc` search, if you enter "x" or
+"big", search will show the `BigX` struct first.

src/doc/rustdoc/src/unstable-features.md

@@ -207,22 +207,6 @@ issue][issue-include].
 [unstable-include]: ../unstable-book/language-features/external-doc.html
 [issue-include]: https://github.com/rust-lang/rust/issues/44732
 
-### Add aliases for an item in documentation search
-
-This feature allows you to add alias(es) to an item when using the `rustdoc` search through the
-`doc(alias)` attribute. Example:
-
-```rust,no_run
-#![feature(doc_alias)]
-
-#[doc(alias = "x")]
-#[doc(alias = "big")]
-pub struct BigX;
-```
-
-Then, when looking for it through the `rustdoc` search, if you enter "x" or
-"big", search will show the `BigX` struct first.
-
 ## Unstable command-line arguments
 
 These features are enabled by passing a command-line flag to Rustdoc, but the flags in question are