From 35b95ec2e2c1b377cb884c706fd0836328e5a90f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 5 Dec 2025 19:18:58 +0900
Subject: [Bug #21669] Add more void value expression check for `if`

If the both branches are void, the `if`/`unless` is also void.
---
 test/ruby/test_syntax.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 3638d83e2b..a64591ecec 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -2021,6 +2021,15 @@ eom
     assert_valid_syntax("tap {a = (true ? true : break)}")
     assert_valid_syntax("tap {a = (break if false)}")
     assert_valid_syntax("tap {a = (break unless true)}")
+
+    assert_syntax_error("#{<<~"{#"}\n#{<<~'};'}", /void value expression/, nil, "#{BUG_21669} 1.4")
+    {#
+      x = if rand < 0.5
+        return
+      else
+        return
+      end
+    };
   end
 
   def test_value_expr_in_singleton
-- 
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