--- a/t/re/reg_mesg-change.t	2019-04-11 10:07:36.626000000 +0800
+++ b/t/re/reg_mesg.t	2019-04-11 10:08:20.032000000 +0800
@@ -309,6 +309,7 @@ my @death =
  '/\A{/' => 'Unescaped left brace in regex is illegal here {#} m/\A{{#}/',
  '/(?<=/' => 'Sequence (?... not terminated {#} m/(?<={#}/',                        # [perl #128170]
  '/\p{vertical  tab}/' => 'Can\'t find Unicode property definition "vertical  tab" {#} m/\\p{vertical  tab}{#}/', # [perl #132055]
+ "/$bug133423/" => "Operand with no preceding operator {#} m/(?[(?^:(?[\\\0]))\\{#}]\0|2[^^]\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80])R.\\670/",
 
 );