1 files changed, 20 insertions, 0 deletions
diff --git a/test/ruby/test_primitive.rb b/test/ruby/test_primitive.rb
index d701348f26..02dab78233 100644
--- a/test/ruby/test_primitive.rb
+++ b/test/ruby/test_primitive.rb
@@ -400,4 +400,24 @@ class TestRubyPrimitive < Test::Unit::TestCase
     #assert_equal [0,1,2,3,4], [0, *a, 4]
   end
 
+  def test_concatarray_ruby_dev_41933
+    bug3658 = '[ruby-dev:41933]'
+    [0, *x=1]
+    assert_equal(1, x, bug3658)
+    [0, *x=1, 2]
+    assert_equal(1, x, bug3658)
+    class << (x = Object.new)
+      attr_accessor :to_a_called
+      def to_a
+        @to_a_called = true
+        [self]
+      end
+    end
+    x.to_a_called = false
+    [0, *x]
+    assert(x.to_a_called, bug3658)
+    x.to_a_called = false
+    [0, *x, 2]
+    assert(x.to_a_called, bug3658)
+  end
 end