Ignore impl associated types in jump to def feature

Author: GuillaumeGomez

src/librustdoc/html/render/span_map.rs

@@ -205,7 +205,13 @@ impl SpanMapVisitor<'_> {
 // panicking.
 fn hir_enclosing_body_owner(tcx: TyCtxt<'_>, hir_id: HirId) -> Option<LocalDefId> {
     for (_, node) in tcx.hir_parent_iter(hir_id) {
-        if let Some((def_id, _)) = node.associated_body() {
+        // FIXME: associated type impl items don't have an associated body, so we don't handle
+        // them currently.
+        if let Node::ImplItem(impl_item) = node
+            && matches!(impl_item.kind, rustc_hir::ImplItemKind::Type(_))
+        {
+            return None;
+        } else if let Some((def_id, _)) = node.associated_body() {
             return Some(def_id);
         }
     }

tests/rustdoc/jump-to-def-ice-assoc-types.rs

@@ -0,0 +1,20 @@
+// This test ensures that associated types don't crash rustdoc jump to def.
+
+//@ compile-flags: -Zunstable-options --generate-link-to-definition
+
+
+#![crate_name = "foo"]
+
+//@ has 'src/foo/jump-to-def-ice-assoc-types.rs.html'
+
+pub trait Trait {
+    type Node;
+}
+
+pub fn y<G: Trait>() {
+    struct X<G>(G);
+
+    impl<G: Trait> Trait for X<G> {
+        type Node = G::Node;
+    }
+}