Fix test output

src/V3Inst.cpp

@@ -510,7 +510,8 @@ private:
                     if (VN_AS(rhsarrp->subDTypep()->skipRefp(), IfaceRefDType)->isVirtual())
                         return;
                     if (!VN_AS(lhsarrp->subDTypep()->skipRefp(), IfaceRefDType)->isVirtual()) {
-                        nodep->lhsp()->v3error("Illegal target of assignment");
+                        nodep->v3warn(E_UNSUPPORTED, "Unexpected target of interface assignment ["
+                                                         << rhsarrp->prettyDTypeNameQ() << "]");
                         return;
                     }
                     if (lhsarrp->elementsConst() != rhsarrp->elementsConst()) {
@@ -549,11 +550,11 @@ private:
                         nodep->addNextHere(assignp);
                     }
                     VL_DO_DANGLING(pushDeletep(nodep->unlinkFrBack()), nodep);
+                    return;
                 }
-            } else {
-                iterateChildren(nodep);
             }
         }
+        iterateChildren(nodep);
     }
 
     //--------------------

test_regress/t/t_interface_dearray_bad.out

@@ -1,17 +1,17 @@
-%Error: t/t_interface_dearray_bad.v:23:7: Illegal target of assignment
-                                        : ... note: In instance 'tb_top'
+%Error-UNSUPPORTED: t/t_interface_dearray_bad.v:23:9: Unexpected target of interface assignment ['IFACEREFDTYPE$[0:5]']
+                                                    : ... note: In instance 'tb_top'
    23 |       a = f;
-      |       ^
-        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
+      |         ^
+                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
 %Error-UNSUPPORTED: t/t_interface_dearray_bad.v:26:13: Array size mismatch in interface assignment
                                                      : ... note: In instance 'tb_top'
    26 |       c.vif = b;
       |             ^
-                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
 %Error: t/t_interface_dearray_bad.v:31:23: Expecting expression to be constant, but variable isn't const: 'i'
                                          : ... note: In instance 'tb_top'
    31 |          d.vif[i] = a[i];
       |                       ^
+        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
 %Error-UNSUPPORTED: t/t_interface_dearray_bad.v:31:23: Non-constant index in RHS interface array selection
                                                      : ... note: In instance 'tb_top'
    31 |          d.vif[i] = a[i];