Write Rustdoc titles like "x in crate::mod - Rust"

This makes Rustdoc titles for items read like
"x in cratename::blah::foo - Rust". Title for modules and other
non-items are unchanged, and still read like
"doccratenameconst::blah::foo - Rust". This makes managing several open
Rustdoc tabs easier.

Closes #84371.

3 files changed, 48 insertions, 0 deletions

diff --git a/src/test/rustdoc/crate-title.rs b/src/test/rustdoc/crate-title.rs
new file mode 100644
index 00000000000..6f96f98e707
--- /dev/null
+++ b/src/test/rustdoc/crate-title.rs
@@ -0,0 +1,3 @@
+#![crate_name = "foo"]
+
+// @has foo/index.html '//head/title' 'foo - Rust'
diff --git a/src/test/rustdoc/item-title.rs b/src/test/rustdoc/item-title.rs
new file mode 100644
index 00000000000..d0fbdf95ddc
--- /dev/null
+++ b/src/test/rustdoc/item-title.rs
@@ -0,0 +1,33 @@
+#![crate_name = "foo"]
+#![feature(doc_keyword)]
+
+// @has foo/fn.widget_count.html '//head/title' 'widget_count in foo - Rust'
+/// blah
+pub fn widget_count() {}
+
+// @has foo/struct.Widget.html '//head/title' 'Widget in foo - Rust'
+pub struct Widget;
+
+// @has foo/constant.ANSWER.html '//head/title' 'ANSWER in foo - Rust'
+pub const ANSWER: u8 = 42;
+
+pub mod blah {
+    // @has foo/blah/struct.Widget.html '//head/title' 'Widget in foo::blah - Rust'
+    pub struct Widget;
+
+    // @has foo/blah/trait.Awesome.html '//head/title' 'Awesome in foo::blah - Rust'
+    pub trait Awesome {}
+
+    // @has foo/blah/fn.make_widget.html '//head/title' 'make_widget in foo::blah - Rust'
+    pub fn make_widget() {}
+
+    // @has foo/macro.cool_macro.html '//head/title' 'cool_macro in foo - Rust'
+    #[macro_export]
+    macro_rules! cool_macro {
+        ($t:tt) => { $t }
+    }
+}
+
+// @has foo/keyword.continue.html '//head/title' 'continue - Rust'
+#[doc(keyword = "continue")]
+mod continue_keyword {}
diff --git a/src/test/rustdoc/mod-title.rs b/src/test/rustdoc/mod-title.rs
new file mode 100644
index 00000000000..6b7f67d17ab
--- /dev/null
+++ b/src/test/rustdoc/mod-title.rs
@@ -0,0 +1,12 @@
+#![crate_name = "foo"]
+
+// @has foo/bar/index.html '//head/title' 'foo::bar - Rust'
+/// blah
+pub mod bar {
+    pub fn a() {}
+}
+
+// @has foo/baz/index.html '//head/title' 'foo::baz - Rust'
+pub mod baz {
+    pub fn a() {}
+}