Now also displays portability tags.

Author: Tor Hovland

src/librustdoc/clean/inline.rs

@@ -477,6 +477,7 @@ fn build_module(
                                 }],
                             },
                             did: None,
+                            attrs: None,
                         },
                         true,
                     )),

src/librustdoc/clean/types.rs

@@ -2081,6 +2081,7 @@ crate enum ImportKind {
 crate struct ImportSource {
     crate path: Path,
     crate did: Option<DefId>,
+    crate attrs: Option<Attributes>,
 }
 
 #[derive(Clone, Debug)]

src/librustdoc/clean/utils.rs

@@ -468,10 +468,10 @@ crate fn register_res(cx: &mut DocContext<'_>, res: Res) -> DefId {
 }
 
 crate fn resolve_use_source(cx: &mut DocContext<'_>, path: Path) -> ImportSource {
-    ImportSource {
-        did: if path.res.opt_def_id().is_none() { None } else { Some(register_res(cx, path.res)) },
-        path,
-    }
+    let did = if path.res.opt_def_id().is_none() { None } else { Some(register_res(cx, path.res)) };
+    let attrs = did.map(|did| cx.tcx.get_attrs(did).clean(cx));
+
+    ImportSource { did, path, attrs }
 }
 
 crate fn enter_impl_trait<F, R>(cx: &mut DocContext<'_>, f: F) -> R

src/librustdoc/html/render/print_item.rs

@@ -282,9 +282,14 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
             }
 
             clean::ImportItem(ref import) => {
-                let (stab, stab_tags) = if let Some(def_id) = import.source.did {
-                    // Just need an item with the correct def_id
-                    let import_item = clean::Item { def_id, ..myitem.clone() };
+                let (stab, stab_tags) = if let (Some(def_id), Some(attrs)) =
+                    (import.source.did, import.source.attrs.clone())
+                {
+                    let attrs = Box::new(attrs);
+
+                    // Just need an item with the correct def_id and attrs
+                    let import_item = clean::Item { def_id, attrs, ..myitem.clone() };
+
                     let stab = import_item.stability_class(cx.tcx());
                     let stab_tags = Some(extra_info_tags(&import_item, item, cx.tcx()));
                     (stab, stab_tags)

src/test/rustdoc/issue-83832.rs

@@ -1,21 +1,36 @@
 #![crate_name = "foo"]
+#![feature(doc_cfg)]
 
-pub mod io {
+pub mod tag {
     #[deprecated(since = "0.1.8", note = "Use bar() instead")]
-    pub trait Reader {}
-    pub trait Writer {}
+    pub trait Deprecated {}
+
+    #[doc(cfg(feature = "sync"))]
+    pub trait Portability {}
+
+    pub trait Unstable {}
 }
 
 // @has foo/mod1/index.html
 pub mod mod1 {
-    // @has - '//code' 'pub use io::Reader;'
+    // @has - '//code' 'pub use tag::Deprecated;'
     // @has - '//span' 'Deprecated'
-    pub use io::Reader;
+    // @!has - '//span' 'sync'
+    pub use tag::Deprecated;
 }
 
 // @has foo/mod2/index.html
 pub mod mod2 {
-    // @has - '//code' 'pub use io::Writer;'
+    // @has - '//code' 'pub use tag::Portability;'
+    // @!has - '//span' 'Deprecated'
+    // @has - '//span' 'sync'
+    pub use tag::Portability;
+}
+
+// @has foo/mod3/index.html
+pub mod mod3 {
+    // @has - '//code' 'pub use tag::Unstable;'
     // @!has - '//span' 'Deprecated'
-    pub use io::Writer;
+    // @!has - '//span' 'sync'
+    pub use tag::Unstable;
 }