Rollup merge of #79412 - GuillaumeGomez:cleanup-rustdoc-tests, r=jyn514

Clean up rustdoc tests by removing unnecessary features

r? ``@jyn514``

src/test/rustdoc-js/doc-alias-filter-out.rs

-#![feature(doc_alias)]
-
 #[doc(alias = "true")]
 pub struct Foo;

src/test/rustdoc-js/doc-alias-filter.rs

-#![feature(doc_alias)]
-
 #[doc(alias = "true")]
 pub struct Foo;
 

src/test/rustdoc-js/doc-alias-whitespace.rs

-#![feature(doc_alias)]
-
 #[doc(alias = "Demon Lord")]
 pub struct Struct;

src/test/rustdoc-js/doc-alias.rs

-#![feature(doc_alias)]
-
 #[doc(alias = "StructItem")]
 pub struct Struct {
     #[doc(alias = "StructFieldItem")]

src/test/rustdoc-ui/check-doc-alias-attr-location.rs

-#![feature(doc_alias)]
-
 pub struct Bar;
 pub trait Foo {
     type X;

src/test/rustdoc-ui/check-doc-alias-attr-location.stderr

 error: `#[doc(alias = "...")]` isn't allowed on extern block
-  --> $DIR/check-doc-alias-attr-location.rs:9:7
+  --> $DIR/check-doc-alias-attr-location.rs:7:7
    |
 LL | #[doc(alias = "foo")]
    |       ^^^^^^^^^^^^^
 
 error: `#[doc(alias = "...")]` isn't allowed on implementation block
-  --> $DIR/check-doc-alias-attr-location.rs:12:7
+  --> $DIR/check-doc-alias-attr-location.rs:10:7
    |
 LL | #[doc(alias = "bar")]
    |       ^^^^^^^^^^^^^
 
 error: `#[doc(alias = "...")]` isn't allowed on implementation block
-  --> $DIR/check-doc-alias-attr-location.rs:18:7
+  --> $DIR/check-doc-alias-attr-location.rs:16:7
    |
 LL | #[doc(alias = "foobar")]
    |       ^^^^^^^^^^^^^^^^
 
 error: `#[doc(alias = "...")]` isn't allowed on type alias in implementation block
-  --> $DIR/check-doc-alias-attr-location.rs:20:11
+  --> $DIR/check-doc-alias-attr-location.rs:18:11
    |
 LL |     #[doc(alias = "assoc")]
    |           ^^^^^^^^^^^^^^^

src/test/rustdoc-ui/check-doc-alias-attr.rs

 #![crate_type = "lib"]
-#![feature(doc_alias)]
 
 #[doc(alias = "foo")] // ok!
 pub struct Bar;

src/test/rustdoc-ui/check-doc-alias-attr.stderr

 error: doc alias attribute expects a string: #[doc(alias = "0")]
-  --> $DIR/check-doc-alias-attr.rs:7:7
+  --> $DIR/check-doc-alias-attr.rs:6:7
    |
 LL | #[doc(alias)]
    |       ^^^^^
 
 error: doc alias attribute expects a string: #[doc(alias = "0")]
-  --> $DIR/check-doc-alias-attr.rs:8:7
+  --> $DIR/check-doc-alias-attr.rs:7:7
    |
 LL | #[doc(alias = 0)]
    |       ^^^^^^^^^
 
 error: doc alias attribute expects a string: #[doc(alias = "0")]
-  --> $DIR/check-doc-alias-attr.rs:9:7
+  --> $DIR/check-doc-alias-attr.rs:8:7
    |
 LL | #[doc(alias("bar"))]
    |       ^^^^^^^^^^^^
 
 error: '\"' character isn't allowed in `#[doc(alias = "...")]`
-  --> $DIR/check-doc-alias-attr.rs:10:7
+  --> $DIR/check-doc-alias-attr.rs:9:7
    |
 LL | #[doc(alias = "\"")]
    |       ^^^^^^^^^^^^
 
 error: '\n' character isn't allowed in `#[doc(alias = "...")]`
-  --> $DIR/check-doc-alias-attr.rs:11:7
+  --> $DIR/check-doc-alias-attr.rs:10:7
    |
 LL | #[doc(alias = "\n")]
    |       ^^^^^^^^^^^^
 
 error: '\n' character isn't allowed in `#[doc(alias = "...")]`
-  --> $DIR/check-doc-alias-attr.rs:12:7
+  --> $DIR/check-doc-alias-attr.rs:11:7
    |
 LL |   #[doc(alias = "
    |  _______^
@@ -37,19 +37,19 @@ LL | | ")]
    | |_^
 
 error: '\t' character isn't allowed in `#[doc(alias = "...")]`
-  --> $DIR/check-doc-alias-attr.rs:14:7
+  --> $DIR/check-doc-alias-attr.rs:13:7
    |
 LL | #[doc(alias = "\t")]
    |       ^^^^^^^^^^^^
 
 error: `#[doc(alias = "...")]` cannot start or end with ' '
-  --> $DIR/check-doc-alias-attr.rs:15:7
+  --> $DIR/check-doc-alias-attr.rs:14:7
    |
 LL | #[doc(alias = " hello")]
    |       ^^^^^^^^^^^^^^^^
 
 error: `#[doc(alias = "...")]` cannot start or end with ' '
-  --> $DIR/check-doc-alias-attr.rs:16:7
+  --> $DIR/check-doc-alias-attr.rs:15:7
    |
 LL | #[doc(alias = "hello ")]
    |       ^^^^^^^^^^^^^^^^

src/test/rustdoc-ui/doc-alias-assoc-const.rs

-#![feature(doc_alias)]
 #![feature(trait_alias)]
 
 pub struct Foo;

src/test/rustdoc-ui/doc-alias-assoc-const.stderr

 error: `#[doc(alias = "...")]` isn't allowed on associated constant in trait implementation block
-  --> $DIR/doc-alias-assoc-const.rs:11:11
+  --> $DIR/doc-alias-assoc-const.rs:10:11
    |
 LL |     #[doc(alias = "CONST_BAZ")]
    |           ^^^^^^^^^^^^^^^^^^^

src/test/rustdoc-ui/doc-test-doctest-feature.rs

@@ -2,13 +2,10 @@
 // compile-flags:--test
 // normalize-stdout-test: "src/test/rustdoc-ui" -> "$$DIR"
 
-#![feature(cfg_doctest)]
-
 // Make sure `cfg(doctest)` is set when finding doctests but not inside
 // the doctests.
 
 /// ```
-/// #![feature(cfg_doctest)]
 /// assert!(!cfg!(doctest));
 /// ```
 #[cfg(doctest)]

src/test/rustdoc-ui/doc-test-doctest-feature.stdout

 
 running 1 test
-test $DIR/doc-test-doctest-feature.rs - Foo (line 10) ... ok
+test $DIR/doc-test-doctest-feature.rs - Foo (line 8) ... ok
 
 test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
 

src/test/rustdoc/deprecated-future.rs

-#![feature(deprecated)]
-
 // @has deprecated_future/index.html '//*[@class="stab deprecated"]' \
 //      'Deprecated'
 // @has deprecated_future/struct.S.html '//*[@class="stab deprecated"]' \

src/test/rustdoc/deprecated.rs

-#![feature(deprecated)]
-
 // @has deprecated/index.html '//*[@class="docblock-short"]/span[@class="stab deprecated"]' \
 //      'Deprecated'
 // @has - '//*[@class="docblock-short"]' 'Deprecated docs'

src/test/rustdoc/issue-76501.rs

-#![feature(const_fn)]
-
 // @has 'issue_76501/fn.bloop.html' '//pre' 'pub const fn bloop() -> i32'
 /// A useless function that always returns 1.
 pub const fn bloop() -> i32 {