From a861c74813b79fd3d5fb2cf69276e8f90a2a0ba3 Mon Sep 17 00:00:00 2001
From: TSUYUSATO Kitsune <make.just.on@gmail.com>
Date: Sun, 19 Nov 2023 11:12:06 +0900
Subject: [PATCH] Add a test

---
 test/ruby/test_syntax.rb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 8e960ee535..e78d30148c 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -1727,6 +1727,11 @@ eom
     assert_valid_syntax("tap {a = (break unless true)}")
   end
 
+  def test_value_expr_in_singleton
+    mesg = /void value expression/
+    assert_syntax_error("class << (return); end", mesg)
+  end
+
   def test_tautological_condition
     assert_valid_syntax("def f() return if false and invalid; nil end")
     assert_valid_syntax("def f() return unless true or invalid; nil end")