Fix intra-doc handling of Self in enum

Fixes rust-lang#82209

Author: lucas-deangelis

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -838,6 +838,9 @@ impl<'a, 'tcx> DocFolder for LinkCollector<'a, 'tcx> {
         debug!("looking for the `Self` type");
         let self_id = if item.is_fake() {
             None
+        // Checking if the item is a field in a variant in an enum
+        } else if (matches!(self.cx.tcx.def_kind(item.def_id), DefKind::Field) && matches!(self.cx.tcx.def_kind(self.cx.tcx.parent(item.def_id).unwrap()), DefKind::Variant)) {
+            self.cx.tcx.parent(item.def_id).and_then(|item_id| self.cx.tcx.parent(item_id))
         } else if matches!(
             self.cx.tcx.def_kind(item.def_id),
             DefKind::AssocConst

src/test/rustdoc/issue-82209.rs

@@ -0,0 +1,8 @@
+#![deny(broken_intra_doc_links)]
+pub enum Foo {
+    Bar {
+        abc: i32,
+        /// [Self::Bar::abc]
+        xyz: i32,
+    },
+}