- if let Some(required_items) = &must_implement_one_of {
- // true if this item is specifically implemented in this impl
- let is_implemented_here = ancestors
- .leaf_def(tcx, trait_item_id)
- .map_or(false, |node_item| !node_item.defining_node.is_from_trait());
+ // true if this item is specifically implemented in this impl
+ let is_implemented_here = ancestors
+ .leaf_def(tcx, trait_item_id)
+ .map_or(false, |node_item| !node_item.defining_node.is_from_trait());
+
+ if !is_implemented_here {
+ match tcx.eval_default_body_stability(trait_item_id, full_impl_span) {
+ EvalResult::Deny { feature, reason, issue, is_soft, .. } => {
+ default_body_is_unstable(
+ tcx,
+ full_impl_span,
+ trait_item_id,
+ feature,
+ reason,
+ issue,
+ is_soft,
+ )
+ }