callable as base for yield and send

more yield tests

test/ruby/test_yield_statement.rb

@@ -1,11 +1,25 @@
 require_relative "helper"
 
 module Ruby
+  class TestYieldStatementVool < MiniTest::Test
+    include RubyTests
+
+    def setup()
+      input = "yield(0)"
+      @lst = compile( input ).to_vool
+    end
+    def test_block
+      assert_equal Vool::YieldStatement , @lst.class
+    end
+    def test_block_args
+      assert_equal Vool::IntegerConstant , @lst.arguments.first.class
+    end
+  end
   class TestYieldStatement < MiniTest::Test
     include RubyTests
 
     def setup()
-      input = "yield(0) "
+      input = "yield(0)"
       @lst = compile( input )
     end
     def test_block