start a new ruby layer to do the to_vool conversion

the "normalization" is getting more and more complicated and is not tested
And it seems i really don't like working with the untyped ast

test/ruby/test_yield_statement.rb

@@ -0,0 +1,28 @@
+require_relative "helper"
+
+module Ruby
+  class TestYieldStatementX < MiniTest::Test
+    include RubyTests
+
+    def setup()
+      input = "def plus_one; yield(0) ; end "
+      @lst = compile( input )
+    end
+    def test_method
+      assert_equal MethodStatement , @lst.class
+    end
+    def test_block
+      assert_equal YieldStatement , @lst.body.class
+    end
+    def test_block_args
+      assert_equal IntegerConstant , @lst.body.arguments.first.class
+    end
+    def test_method_yield?
+      assert_equal true , @lst.has_yield?
+    end
+    def test_method_args
+      Parfait.boot!
+      assert_equal 2 , @lst.make_arg_type.get_length
+    end
+  end
+end