rustdoc: use import stability marker in display

Author: notriddle

src/librustdoc/passes/propagate_stability.rs

@@ -36,6 +36,7 @@ impl DocFolder for StabilityPropagator<'_, '_> {
 
         let stability = match item.item_id {
             ItemId::DefId(def_id) => {
+                let def_id = item.inline_stmt_id.map(|did| did.into()).unwrap_or(def_id);
                 let own_stability = self.cx.tcx.lookup_stability(def_id);
 
                 let (ItemKind::StrippedItem(box kind) | kind) = &item.kind;

tests/rustdoc/inline_local/staged-inline.rs

@@ -0,0 +1,18 @@
+// https://github.com/rust-lang/rust/issues/135078
+#![crate_name = "foo"]
+#![feature(staged_api)]
+#![stable(feature = "v1", since="1.0.0")]
+
+#[stable(feature = "v1", since="1.0.0")]
+pub mod ffi {
+    #[stable(feature = "core_ffi", since="1.99.0")]
+    //@ matches "foo/ffi/struct.CStr.html" "//span[@class='sub-heading']/span[@class='since']" "1.99.0"
+    //@ !matches - "//span[@class='sub-heading']/span[@class='since']" "1.0.0"
+    pub struct CStr;
+}
+
+#[stable(feature = "v1", since = "1.0.0")]
+#[doc(inline)]
+//@ matches "foo/struct.CStr.html" "//span[@class='sub-heading']/span[@class='since']" "1.0.0"
+//@ !matches - "//span[@class='sub-heading']/span[@class='since']" "1.99.0"
+pub use ffi::CStr;