Alter the error message when an error list is put in an error list

pkg/api/errors/validation.go

@@ -140,7 +140,7 @@ func (list ValidationErrorList) Prefix(prefix string) ValidationErrorList {
 			}
 			list[i] = err
 		} else {
-			glog.Warningf("ValidationErrorList holds non-ValidationError: %T", list)
+			glog.Warningf("Programmer error: ValidationErrorList holds non-ValidationError: %#v", list[i])
 		}
 	}
 	return list