Span delayed bug if there is no resolution for delegation

Author: aerooneqq

compiler/rustc_ast_lowering/src/delegation.rs

@@ -124,6 +124,11 @@ pub fn delegations_resolutions(
         if let Some(info) = resolver.delegation_info(def_id) {
             let res = info.resolution_id.map(|id| check_for_cycles(tcx, id, span).map(|_| id));
             result.insert(def_id, res.flatten());
+        } else {
+            tcx.dcx().span_delayed_bug(
+                span,
+                format!("delegation resolution record was not found for {def_id:?}"),
+            );
         }
     }