1 files changed, 11 insertions, 0 deletions
diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index 4ff808418f..0af29d9f32 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -770,4 +770,15 @@ class TestISeq < Test::Unit::TestCase
     assert_syntax_error("false and break", mesg)
     assert_syntax_error("if false and break; end", mesg)
   end
+
+  def test_unreachable_pattern_matching
+    assert_in_out_err([], "#{<<~"begin;"}\n#{<<~'end;'}", %w[1])
+    begin;
+      if true or {a: 0} in {a:}
+        p 1
+      else
+        p 0
+      end
+    end;
+  end
 end