rustdoc: Rename "Type Definition" to "Type Alias"

This matches the name used by the Rust Reference [1], which is also what
people usually call these items.

[1]: https://doc.rust-lang.org/reference/items/type-aliases.html

src/librustdoc/html/render/mod.rs

@@ -2123,7 +2123,7 @@ impl ItemSection {
             Self::Unions => "Unions",
             Self::Enums => "Enums",
             Self::Functions => "Functions",
-            Self::TypeDefinitions => "Type Definitions",
+            Self::TypeDefinitions => "Type Aliases",
             Self::Statics => "Statics",
             Self::Constants => "Constants",
             Self::Traits => "Traits",

src/librustdoc/html/render/print_item.rs

@@ -198,7 +198,7 @@ pub(super) fn print_item(
         clean::StructItem(..) => "Struct ",
         clean::UnionItem(..) => "Union ",
         clean::EnumItem(..) => "Enum ",
-        clean::TypedefItem(..) => "Type Definition ",
+        clean::TypedefItem(..) => "Type Alias ",
         clean::MacroItem(..) => "Macro ",
         clean::ProcMacroItem(ref mac) => match mac.kind {
             MacroKind::Bang => "Macro ",

src/librustdoc/html/static/js/main.js

@@ -499,7 +499,7 @@ function preLoadCss(cssUrl) {
             block("static", "static", "Statics");
             block("trait", "traits", "Traits");
             block("fn", "functions", "Functions");
-            block("type", "types", "Type Definitions");
+            block("type", "types", "Type Aliases");
             block("foreigntype", "foreign-types", "Foreign Types");
             block("keyword", "keywords", "Keywords");
             block("traitalias", "trait-aliases", "Trait Aliases");

tests/rustdoc/issue-105735-overlapping-reexport-2.rs

@@ -8,7 +8,7 @@
 // @has - '//*[@class="item-name"]/a[@class="constant"]' 'AtomicU8'
 // We also ensure we don't have another item displayed.
 // @count - '//*[@id="main-content"]/*[@class="small-section-header"]' 2
-// @has - '//*[@id="main-content"]/*[@class="small-section-header"]' 'Type Definitions'
+// @has - '//*[@id="main-content"]/*[@class="small-section-header"]' 'Type Aliases'
 // @has - '//*[@id="main-content"]/*[@class="small-section-header"]' 'Constants'
 
 mod other {

tests/rustdoc/issue-109449-doc-hidden-reexports.rs

@@ -104,7 +104,7 @@ pub mod glob_reexport {
     // @count - '//*[@id="main-content"]/*[@class="small-section-header"]' 3
     // @has - '//*[@id="main-content"]/*[@class="small-section-header"]' 'Re-exports'
     // @has - '//*[@id="main-content"]/*[@class="small-section-header"]' 'Structs'
-    // @has - '//*[@id="main-content"]/*[@class="small-section-header"]' 'Type Definitions'
+    // @has - '//*[@id="main-content"]/*[@class="small-section-header"]' 'Type Aliases'
 
     // Now we check we have 1 re-export and 2 inlined items.
     // If not item from a glob re-export is visible, we don't show the re-export.
@@ -135,9 +135,9 @@ pub mod doc_hidden_reexport {
     // @has - '//a[@class="struct"]' 'Reexport'
     // Check that the `#[doc(hidden)]` re-export's attributes are not taken into account.
     // @has - '//*[@class="desc docblock-short"]' 'Visible. Original.'
+    /// Visible.
+    pub use self::Bar3 as Reexport;
     /// Hidden.
     #[doc(hidden)]
     pub use crate::private::Bar3;
-    /// Visible.
-    pub use self::Bar3 as Reexport;
 }

tests/rustdoc/sidebar-all-page.rs

@@ -1,5 +1,4 @@
 #![crate_name = "foo"]
-
 #![feature(rustc_attrs)]
 
 // @has 'foo/all.html'
@@ -9,7 +8,7 @@
 // @has - '//*[@class="sidebar-elems"]//li' 'Functions'
 // @has - '//*[@class="sidebar-elems"]//li' 'Traits'
 // @has - '//*[@class="sidebar-elems"]//li' 'Macros'
-// @has - '//*[@class="sidebar-elems"]//li' 'Type Definitions'
+// @has - '//*[@class="sidebar-elems"]//li' 'Type Aliases'
 // @has - '//*[@class="sidebar-elems"]//li' 'Constants'
 // @has - '//*[@class="sidebar-elems"]//li' 'Statics'
 // @has - '//*[@class="sidebar-elems"]//li' 'Primitive Types'
@@ -26,7 +25,7 @@ pub fn foo() {}
 pub trait Trait {}
 #[macro_export]
 macro_rules! foo {
-    () => {}
+    () => {};
 }
 pub type Type = u8;
 pub const FOO: u8 = 0;

tests/rustdoc/titles.rs

@@ -30,7 +30,7 @@ pub struct FooStruct;
 // @matches 'foo/enum.FooEnum.html' '//h2[@class="location"]' 'FooEnum'
 pub enum FooEnum {}
 
-// @matches 'foo/type.FooType.html' '//h1' 'Type Definition foo::FooType'
+// @matches 'foo/type.FooType.html' '//h1' 'Type Alias foo::FooType'
 // @matches 'foo/type.FooType.html' '//h2[@class="location"]' 'FooType'
 pub type FooType = FooStruct;