add block argument test #2144

test/t/bs_block.rb

@@ -520,3 +520,15 @@ assert('BS Block 38') do
 
   assert_equal [1,2,3,4,5], iter{|a,b,c=:c,d,e| [a,b,c,d,e]}
 end
+
+assert('BS Block 39') do
+  def iter
+    yield 1
+  end
+
+  assert_equal([1, 2, nil]) do
+    iter{|a, b=2, c|
+      [a, b, c]
+    }
+  end
+end