feat: render Object Safety informations non-object safe traits

Author: poliorcetics

src/librustdoc/clean/types.rs

@@ -1455,6 +1455,9 @@ impl Trait {
     pub(crate) fn unsafety(&self, tcx: TyCtxt<'_>) -> hir::Unsafety {
         tcx.trait_def(self.def_id).unsafety
     }
+    pub(crate) fn is_object_safe(&self, tcx: TyCtxt<'_>) -> bool {
+        tcx.check_is_object_safe(self.def_id)
+    }
 }
 
 #[derive(Clone, Debug)]

src/librustdoc/html/render/print_item.rs

@@ -959,6 +959,20 @@ fn item_trait(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, t: &clean:
     let cloned_shared = Rc::clone(&cx.shared);
     let cache = &cloned_shared.cache;
     let mut extern_crates = FxHashSet::default();
+
+    if !t.is_object_safe(cx.tcx()) {
+        write_small_section_header(
+            w,
+            "object-safety",
+            "Object Safety",
+            &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>",
+                base = crate::clean::utils::DOC_RUST_LANG_ORG_CHANNEL
+            ),
+        );
+    }
+
     if let Some(implementors) = cache.implementors.get(&it.item_id.expect_def_id()) {
         // The DefId is for the first Type found with that name. The bool is
         // if any Types with the same name but different DefId have been found.

src/librustdoc/html/render/sidebar.rs

@@ -218,6 +218,14 @@ fn sidebar_trait<'a>(
     .map(|(id, title, items)| LinkBlock::new(Link::new(id, title), "", items))
     .collect();
     sidebar_assoc_items(cx, it, &mut blocks);
+
+    if !t.is_object_safe(cx.tcx()) {
+        blocks.push(LinkBlock::forced(
+            Link::new("object-safety", "Object Safety"),
+            "object-safety-note",
+        ));
+    }
+
     blocks.push(LinkBlock::forced(Link::new("implementors", "Implementors"), "impl"));
     if t.is_auto(cx.tcx()) {
         blocks.push(LinkBlock::forced(