Avoid panic

Signed-off-by: xizheyin <[email protected]>

Author: xizheyin

src/librustdoc/passes/strip_hidden.rs

@@ -90,8 +90,9 @@ impl DocFolder for Stripper<'_, '_> {
         let has_doc_hidden = i.is_doc_hidden();
 
         if let clean::ImportItem(clean::Import { source, .. }) = &i.kind {
-            if let Some(source_did) = source.did {
-                let import_def_id = i.def_id().unwrap().expect_local();
+            if let Some(source_did) = source.did
+                && let Some(import_def_id) = i.def_id().and_then(|def_id| def_id.as_local())
+            {
                 let reexports = reexport_chain(self.tcx, import_def_id, source_did);
 
                 // Check if any reexport in the chain has a hidden source