Use the message given to TestRubyOptions#assert_segv

Author: nobu

test/ruby/test_rubyoptions.rb

@@ -847,7 +847,11 @@ def assert_segv(args, message=nil, list: SEGVTest::ExpectedStderrList, **opt, &b
     args.unshift(env)
 
     test_stdin = ""
-    tests = [//, list] unless block
+    if !block
+      tests = [//, list, message]
+    elsif message
+      tests = [[], [], message]
+    end
 
     assert_in_out_err(args, test_stdin, *tests, encoding: "ASCII-8BIT",
                       **SEGVTest::ExecOptions, **opt, &block)