Rollup merge of #131594 - fmease:rustdoc-mv-obj-safe-dyn-compat, r=notriddle

rustdoc: Rename "object safe" to "dyn compatible"

Supersedes #126554:

1. In line with [T-lang's latest resolution](https://github.com/rust-lang/lang-team/issues/286#issuecomment-2338905118).
2. More comprehensive: Not only updates user-facing text but also source code.

Part of #130852.

Doesn't update rustdoc-JSON (will be filed separately).

r? `@notriddle` (rust-lang/lang-team#286) `@GuillaumeGomez` (for visibility)

8 files changed, 44 insertions, 42 deletions

diff --git a/src/librustdoc/clean/types.rs b/src/librustdoc/clean/types.rs
index bc5bf4c0583..44295fa0cd9 100644
--- a/src/librustdoc/clean/types.rs
+++ b/src/librustdoc/clean/types.rs
@@ -1450,7 +1450,7 @@ impl Trait {
     pub(crate) fn safety(&self, tcx: TyCtxt<'_>) -> hir::Safety {
         tcx.trait_def(self.def_id).safety
     }
-    pub(crate) fn is_object_safe(&self, tcx: TyCtxt<'_>) -> bool {
+    pub(crate) fn is_dyn_compatible(&self, tcx: TyCtxt<'_>) -> bool {
         tcx.is_dyn_compatible(self.def_id)
     }
 }
diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index 5dacabd031e..315b7742a4c 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -2002,7 +2002,7 @@ fn init_id_map() -> FxHashMap<Cow<'static, str>, usize> {
     map.insert("required-associated-consts".into(), 1);
     map.insert("required-methods".into(), 1);
     map.insert("provided-methods".into(), 1);
-    map.insert("object-safety".into(), 1);
+    map.insert("dyn-compatibility".into(), 1);
     map.insert("implementors".into(), 1);
     map.insert("synthetic-implementors".into(), 1);
     map.insert("implementations-list".into(), 1);
diff --git a/src/librustdoc/html/render/print_item.rs b/src/librustdoc/html/render/print_item.rs
index 3c96f873681..5e9cbef99a9 100644
--- a/src/librustdoc/html/render/print_item.rs
+++ b/src/librustdoc/html/render/print_item.rs
@@ -934,16 +934,18 @@ fn item_trait(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, t: &clean:
     let cache = &cloned_shared.cache;
     let mut extern_crates = FxIndexSet::default();
 
-    if !t.is_object_safe(cx.tcx()) {
+    if !t.is_dyn_compatible(cx.tcx()) {
+        // FIXME(dyn_compat_renaming): Update the URL once the Reference is updated.
         write_section_heading(
             w,
-            "Object Safety",
-            "object-safety",
+            "Dyn Compatibility",
+            "dyn-compatibility",
             None,
             &format!(
-                "<div class=\"object-safety-info\">This trait is <b>not</b> \
-                <a href=\"{base}/reference/items/traits.html#object-safety\">\
-                object safe</a>.</div>",
+                "<div class=\"dyn-compatibility-info\"><p>This trait is <b>not</b> \
+                <a href=\"{base}/reference/items/traits.html#object-safety\">dyn compatible</a>.</p>\
+                <p><i>In older versions of Rust, dyn compatibility was called \"object safety\", \
+                so this trait is not object safe.</i></p></div>",
                 base = crate::clean::utils::DOC_RUST_LANG_ORG_CHANNEL
             ),
         );
diff --git a/src/librustdoc/html/render/sidebar.rs b/src/librustdoc/html/render/sidebar.rs
index e7706e7fdea..6df9486e658 100644
--- a/src/librustdoc/html/render/sidebar.rs
+++ b/src/librustdoc/html/render/sidebar.rs
@@ -315,10 +315,10 @@ fn sidebar_trait<'a>(
     );
     sidebar_assoc_items(cx, it, blocks);
 
-    if !t.is_object_safe(cx.tcx()) {
+    if !t.is_dyn_compatible(cx.tcx()) {
         blocks.push(LinkBlock::forced(
-            Link::new("object-safety", "Object Safety"),
-            "object-safety-note",
+            Link::new("dyn-compatibility", "Dyn Compatibility"),
+            "dyn-compatibility-note",
         ));
     }
 
diff --git a/src/librustdoc/json/conversions.rs b/src/librustdoc/json/conversions.rs
index b8791c9918b..77e7d83090b 100644
--- a/src/librustdoc/json/conversions.rs
+++ b/src/librustdoc/json/conversions.rs
@@ -672,7 +672,7 @@ impl FromClean<clean::Trait> for Trait {
         let tcx = renderer.tcx;
         let is_auto = trait_.is_auto(tcx);
         let is_unsafe = trait_.safety(tcx) == rustc_hir::Safety::Unsafe;
-        let is_object_safe = trait_.is_object_safe(tcx);
+        let is_object_safe = trait_.is_dyn_compatible(tcx);
         let clean::Trait { items, generics, bounds, .. } = trait_;
         Trait {
             is_auto,
diff --git a/tests/rustdoc/dyn-compatibility.rs b/tests/rustdoc/dyn-compatibility.rs
new file mode 100644
index 00000000000..9115f93bc3b
--- /dev/null
+++ b/tests/rustdoc/dyn-compatibility.rs
@@ -0,0 +1,27 @@
+#![crate_name = "foo"]
+
+//@ has 'foo/trait.DynIncompatible.html'
+//@ has - '//*[@class="dyn-compatibility-info"]' 'This trait is not dyn compatible.'
+//@ has - '//*[@id="dyn-compatibility"]' 'Dyn Compatibility'
+pub trait DynIncompatible {
+    fn foo() -> Self;
+}
+
+//@ has 'foo/trait.DynIncompatible2.html'
+//@ has - '//*[@class="dyn-compatibility-info"]' 'This trait is not dyn compatible.'
+//@ has - '//*[@id="dyn-compatibility"]' 'Dyn Compatibility'
+pub trait DynIncompatible2<T> {
+    fn foo(i: T);
+}
+
+//@ has 'foo/trait.DynCompatible.html'
+//@ !has - '//*[@class="dyn-compatibility-info"]' ''
+//@ !has - '//*[@id="dyn-compatibility"]' ''
+pub trait DynCompatible {
+    fn foo(&self);
+}
+
+//@ has 'foo/struct.Foo.html'
+//@ count - '//*[@class="dyn-compatibility-info"]' 0
+//@ count - '//*[@id="dyn-compatibility"]' 0
+pub struct Foo;
diff --git a/tests/rustdoc/sidebar/sidebar-items.rs b/tests/rustdoc/sidebar/sidebar-items.rs
index f3812143a7d..57c2eee91a9 100644
--- a/tests/rustdoc/sidebar/sidebar-items.rs
+++ b/tests/rustdoc/sidebar/sidebar-items.rs
@@ -14,7 +14,7 @@
 //@ has - '//*[@class="sidebar-elems"]//section//a' 'Output'
 //@ has - '//div[@class="sidebar-elems"]//h3/a[@href="#provided-associated-types"]' 'Provided Associated Types'
 //@ has - '//*[@class="sidebar-elems"]//section//a' 'Extra'
-//@ has - '//div[@class="sidebar-elems"]//h3/a[@href="#object-safety"]' 'Object Safety'
+//@ has - '//div[@class="sidebar-elems"]//h3/a[@href="#dyn-compatibility"]' 'Dyn Compatibility'
 pub trait Foo {
     const FOO: usize;
     const BAR: u32 = 0;
@@ -25,9 +25,9 @@ pub trait Foo {
     fn bar() -> Self::Output;
 }
 
-//@ has foo/trait.Safe.html
+//@ has foo/trait.DynCompatible.html
 //@ !has - '//div[@class="sidebar-elems"]//h3/a[@href="#object-safety"]' ''
-pub trait Safe {
+pub trait DynCompatible {
     fn access(&self);
 }
 
diff --git a/tests/rustdoc/trait-object-safe.rs b/tests/rustdoc/trait-object-safe.rs
deleted file mode 100644
index b4e986c8f69..00000000000
--- a/tests/rustdoc/trait-object-safe.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-#![crate_name = "foo"]
-
-//@ has 'foo/trait.Unsafe.html'
-//@ has - '//*[@class="object-safety-info"]' 'This trait is not object safe.'
-//@ has - '//*[@id="object-safety"]' 'Object Safety'
-pub trait Unsafe {
-    fn foo() -> Self;
-}
-
-//@ has 'foo/trait.Unsafe2.html'
-//@ has - '//*[@class="object-safety-info"]' 'This trait is not object safe.'
-//@ has - '//*[@id="object-safety"]' 'Object Safety'
-pub trait Unsafe2<T> {
-    fn foo(i: T);
-}
-
-//@ has 'foo/trait.Safe.html'
-//@ !has - '//*[@class="object-safety-info"]' ''
-//@ !has - '//*[@id="object-safety"]' ''
-pub trait Safe {
-    fn foo(&self);
-}
-
-//@ has 'foo/struct.Foo.html'
-//@ count - '//*[@class="object-safety-info"]' 0
-//@ count - '//*[@id="object-safety"]' 0
-pub struct Foo;