diff --git a/lib/parfait/behaviour.rb b/lib/parfait/behaviour.rb
index 99f1f370..133321c9 100644
--- a/lib/parfait/behaviour.rb
+++ b/lib/parfait/behaviour.rb
@@ -52,7 +52,6 @@ module Parfait
 
     def get_instance_method( fname )
       raise "get_instance_method #{fname}.#{fname.class}" unless fname.is_a?(Symbol)
-      #if we had a hash this would be easier.  Detect or find would help too
       @instance_methods.find {|m| m.name == fname }
     end
 
diff --git a/lib/parfait/class.rb b/lib/parfait/class.rb
index b82015b2..be29dc4b 100644
--- a/lib/parfait/class.rb
+++ b/lib/parfait/class.rb
@@ -17,7 +17,7 @@
 module Parfait
   class Class < Behaviour
 
-    attr_reader :name , :super_class_name , :singleton_class
+    attr_reader :name , :super_class_name , :single_class
 
     def self.type_length
       6
@@ -30,7 +30,7 @@ module Parfait
       super(instance_type)
       @name = name
       @super_class_name = superclass
-      @singleton_class = SingletonClass.new( self , self.type || @name)
+      @single_class = SingletonClass.new( self , self.type || @name)
     end
 
     def rxf_reference_name
diff --git a/lib/risc/parfait_boot.rb b/lib/risc/parfait_boot.rb
index 1d9f6217..05841fc2 100644
--- a/lib/risc/parfait_boot.rb
+++ b/lib/risc/parfait_boot.rb
@@ -51,7 +51,7 @@ module Parfait
     classes.each do |name , cl|
       object_type = Parfait.object_space.get_type_by_class_name(name)
       raise "nil type" unless object_type
-      cl.singleton_class.instance_eval{ @instance_type = class_type}
+      cl.single_class.instance_eval{ @instance_type = class_type}
       cl.instance_eval{ @instance_type = object_type}
       cl.instance_eval{ @super_class_name = super_names[name] || :Object}
       object_type.instance_eval{ @object_class = cl }
@@ -79,6 +79,9 @@ module Parfait
        Data16: :DataObject ,
        Data32: :DataObject ,
        BinaryCode: :Data32 ,
+       TrueClass: :Data4 ,
+       FalseClass: :Data4 ,
+       NilClass: :Data4 ,
        Integer: :Data4 ,
        Word: :Data8 ,
        List: :Data16 ,
@@ -106,7 +109,7 @@ module Parfait
                        arguments_type: :Type , self_type: :Type, frame_type: :Type ,
                        name: :Word , blocks: :Block} ,
       Class: {instance_methods: :List, instance_type: :Type,
-              name: :Word, super_class_name: :Word , singleton_class: :SingletonClass},
+              name: :Word, super_class_name: :Word , single_class: :SingletonClass},
       DataObject: {},
       Data4: {},
       Data8: {},
diff --git a/lib/ruby/class_statement.rb b/lib/ruby/class_statement.rb
index 32a8334f..254b5fd9 100644
--- a/lib/ruby/class_statement.rb
+++ b/lib/ruby/class_statement.rb
@@ -71,7 +71,11 @@ module Ruby
     end
 
     def to_s(depth = 0)
-      at_depth(depth , "class #{name}" , @body.to_s(depth + 1) , "end")
+      at_depth(depth , "class #{name} #{super_s}\n#{@body.to_s(depth + 1)}\nend")
+    end
+    # deriviation if apropriate
+    def super_s
+      @super_class_name ? " < #{@super_class_name}" : ""
     end
   end
 end
diff --git a/lib/ruby/method_statement.rb b/lib/ruby/method_statement.rb
index 122b5ddb..900bd585 100644
--- a/lib/ruby/method_statement.rb
+++ b/lib/ruby/method_statement.rb
@@ -39,7 +39,7 @@ module Ruby
 
     def to_s(depth = 0)
       arg_str = @args.collect{|a| a.to_s}.join(', ')
-      at_depth(depth , "def #{name}(#{arg_str})" , @body.to_s(depth + 1) , "end")
+      at_depth(depth , "def #{name}(#{arg_str})\n #{@body.to_s(1)}\nend")
     end
 
   end
diff --git a/lib/vool/class_expression.rb b/lib/vool/class_expression.rb
index 38daee92..e5522573 100644
--- a/lib/vool/class_expression.rb
+++ b/lib/vool/class_expression.rb
@@ -59,7 +59,7 @@ module Vool
         when MethodExpression
           node.to_mom(@clazz)
         when ClassMethodExpression
-          node.to_mom(@clazz.singleton_class)
+          node.to_mom(@clazz.single_class)
         else
           raise "Only methods for now #{node.class}:#{node}"
         end
@@ -78,7 +78,7 @@ module Vool
         when MethodExpression
           target = @clazz
         when ClassMethodExpression
-          target = @clazz.singleton_class
+          target = @clazz.single_class
         else
           raise "Only methods for now #{node.class}:#{node}"
         end
diff --git a/lib/vool/class_method_expression.rb b/lib/vool/class_method_expression.rb
index 9eb5d430..93fbf2e4 100644
--- a/lib/vool/class_method_expression.rb
+++ b/lib/vool/class_method_expression.rb
@@ -12,11 +12,11 @@ module Vool
     # Must pass in the actual Parfait class (default nil is just to conform to api)
     def to_parfait( clazz = nil )
       raise "No class given to class method #{name}" unless clazz
-      clazz.add_instance_method_for(name , make_arg_type , make_frame , body )
+      clazz.single_class.add_instance_method_for(name , make_arg_type , make_frame , body )
     end
 
     def to_mom(clazz)
-      raise "not singleton" unless clazz.class == Parfait::SingletonClass
+      raise "not singleton #{clazz.class}" unless clazz.class == Parfait::SingletonClass
       raise( "no class in #{self}") unless clazz
       method = clazz.get_instance_method(name )
       raise( "no class method in #{@name} in #{clazz}") unless method
diff --git a/lib/vool/variables.rb b/lib/vool/variables.rb
index 2acaa180..2d4dcfa5 100644
--- a/lib/vool/variables.rb
+++ b/lib/vool/variables.rb
@@ -49,7 +49,7 @@ module Vool
   class ModuleName < Expression
     include Named
     def ct_type
-      get_named_class.singleton_class.instance_type
+      get_named_class.single_class.instance_type
     end
     def to_slot(_)
       return Mom::SlotDefinition.new( get_named_class, [])
diff --git a/test/elf/test_somethingelse.rb b/test/elf/test_somethingelse.rb
index f0eb94e8..f1c116de 100644
--- a/test/elf/test_somethingelse.rb
+++ b/test/elf/test_somethingelse.rb
@@ -6,7 +6,7 @@ module Elf
     def test_string_put
       hello = "Hello World!\n"
       input = "return '#{hello}'.putstring"
-      preload = "class Word;def putstring;X.putstring;end;end;"
+      preload = "class Word < Data8;def putstring;X.putstring;end;end;"
       @stdout = hello
       @exit_code = hello.length
       check preload + as_main(input), "hello"
diff --git a/test/mains/source/classname_Space_5.rb b/test/mains/source/classname_Space_5.rb
index 00393964..f3bfe11b 100644
--- a/test/mains/source/classname_Space_5.rb
+++ b/test/mains/source/classname_Space_5.rb
@@ -1,4 +1,4 @@
-class Class
+class Class < Behaviour
   def name
     @name
   end
diff --git a/test/mains/test_new.rb b/test/mains/test_new.rb
index 33e3f899..accbd525 100644
--- a/test/mains/test_new.rb
+++ b/test/mains/test_new.rb
@@ -16,7 +16,7 @@ module Mains
 
     def whole_input
       <<-eos
-        class Class
+        class Class < Behaviour
           def get_name
             @name
           end
diff --git a/test/parfait/test_singleton_class.rb b/test/parfait/test_singleton_class.rb
index e7195687..8e4ce436 100644
--- a/test/parfait/test_singleton_class.rb
+++ b/test/parfait/test_singleton_class.rb
@@ -5,7 +5,7 @@ module Parfait
 
     def setup
       super
-      @try = @space.create_class( :Try , :Object).singleton_class
+      @try = @space.create_class( :Try , :Object).single_class
     end
 
     def test_type_forclass
diff --git a/test/parfait/test_space.rb b/test/parfait/test_space.rb
index 4256a4a1..4be62b87 100644
--- a/test/parfait/test_space.rb
+++ b/test/parfait/test_space.rb
@@ -28,7 +28,7 @@ module Parfait
       assert_equal Parfait::Class , space_class.class
     end
     def test_get_singleton_class
-      assert_equal Parfait::SingletonClass , space_class.singleton_class.class
+      assert_equal Parfait::SingletonClass , space_class.single_class.class
     end
     def test_get_type_by_class_name
       assert_equal Parfait::Type , Parfait.object_space.get_type_by_class_name(:Space).class
@@ -74,7 +74,7 @@ module Parfait
     end
     def test_all_singletons
       @space.classes.each do |name , clazz|
-        assert clazz.singleton_class , clazz.name
+        assert clazz.single_class , clazz.name
       end
     end
     def test_has_factory
diff --git a/test/risc/interpreter/class/test_class_inst.rb b/test/risc/interpreter/class/test_class_inst.rb
index c046c6e7..baa7cf64 100644
--- a/test/risc/interpreter/class/test_class_inst.rb
+++ b/test/risc/interpreter/class/test_class_inst.rb
@@ -19,7 +19,6 @@ module Risc
 MAIN
       super
     end
-#Space type is wrong, shold be same as singleton_class.instance_type
     def test_chain
       #show_main_ticks # get output of what is
       run_input @string_input
diff --git a/test/rubyx/helper.rb b/test/rubyx/helper.rb
index bab6af15..bda9d5ba 100644
--- a/test/rubyx/helper.rb
+++ b/test/rubyx/helper.rb
@@ -15,6 +15,7 @@ module RubyX
     end
     def compile_in_test( input , options = {})
       vool = ruby_to_vool(in_Test(input) , options)
+      vool.to_parfait
       vool.to_mom(nil)
       itest = Parfait.object_space.get_class_by_name(:Test)
       assert itest
@@ -23,7 +24,7 @@ module RubyX
   end
   module ParfaitHelper
     include Preloader
-    
+
     def load_parfait(file)
       File.read File.expand_path("../../../lib/parfait/#{file}.rb",__FILE__)
     end
diff --git a/test/rubyx/macro/test_integer_comparison.rb b/test/rubyx/macro/test_integer_comparison.rb
index c7583307..da9cac0a 100644
--- a/test/rubyx/macro/test_integer_comparison.rb
+++ b/test/rubyx/macro/test_integer_comparison.rb
@@ -8,7 +8,7 @@ module RubyX
       def len ; 25 ; end
       def source
         <<GET
-        class Integer
+        class Integer < Data4
           def #{op}(other)
             X.comparison(:"#{op}")
           end
diff --git a/test/rubyx/macro/test_integer_div10.rb b/test/rubyx/macro/test_integer_div10.rb
index cd4a8973..997a03f7 100644
--- a/test/rubyx/macro/test_integer_div10.rb
+++ b/test/rubyx/macro/test_integer_div10.rb
@@ -6,7 +6,7 @@ module RubyX
       include MacroHelper
       def source
         <<GET
-        class Integer
+        class Integer < Data4
           def div10
             X.div10
           end
diff --git a/test/rubyx/macro/test_integer_div4.rb b/test/rubyx/macro/test_integer_div4.rb
index e9f0d254..222c34c4 100644
--- a/test/rubyx/macro/test_integer_div4.rb
+++ b/test/rubyx/macro/test_integer_div4.rb
@@ -6,7 +6,7 @@ module RubyX
       include MacroHelper
       def source
         <<GET
-        class Integer
+        class Integer < Data4
           def div4
             X.div4
           end
diff --git a/test/rubyx/macro/test_integer_operator.rb b/test/rubyx/macro/test_integer_operator.rb
index b06c542b..577e7f6a 100644
--- a/test/rubyx/macro/test_integer_operator.rb
+++ b/test/rubyx/macro/test_integer_operator.rb
@@ -7,7 +7,7 @@ module RubyX
       def op ; :+ ; end
       def source
         <<GET
-        class Integer
+        class Integer  < Data4
           def #{op}(other)
             X.int_operator(:"#{op}")
           end
diff --git a/test/rubyx/macro/test_word_get.rb b/test/rubyx/macro/test_word_get.rb
index 25c5c6d4..180007ce 100644
--- a/test/rubyx/macro/test_word_get.rb
+++ b/test/rubyx/macro/test_word_get.rb
@@ -6,7 +6,7 @@ module RubyX
       include MacroHelper
       def source
         <<GET
-        class Word
+        class Word < Data8
           def get_internal_byte(at)
             X.get_internal_byte
           end
diff --git a/test/rubyx/macro/test_word_putstring.rb b/test/rubyx/macro/test_word_putstring.rb
index a65f9198..05b64f44 100644
--- a/test/rubyx/macro/test_word_putstring.rb
+++ b/test/rubyx/macro/test_word_putstring.rb
@@ -6,7 +6,7 @@ module RubyX
       include MacroHelper
       def source
         <<GET
-        class Word
+        class Word < Data8
           def putstring
             X.putstring
           end
diff --git a/test/rubyx/macro/test_word_set.rb b/test/rubyx/macro/test_word_set.rb
index f9c7db11..b5c5ab65 100644
--- a/test/rubyx/macro/test_word_set.rb
+++ b/test/rubyx/macro/test_word_set.rb
@@ -6,7 +6,7 @@ module RubyX
       include MacroHelper
       def source
         <<GET
-        class Word
+        class Word < Data8
           def set_internal_byte( at , value)
             X.set_internal_byte
           end
diff --git a/test/vool/class_send/test_class_def.rb b/test/vool/class_send/test_class_def.rb
index a0cee17d..01066b06 100644
--- a/test/vool/class_send/test_class_def.rb
+++ b/test/vool/class_send/test_class_def.rb
@@ -19,7 +19,7 @@ module Vool
     end
 
     def setup
-      source = "class Integer;def +(other);X.int_operator(:+);end;end;" + class_main
+      source = "class Integer<Data4;def +(other);X.int_operator(:+);end;end;" + class_main
       ret = RubyX::RubyXCompiler.new(RubyX.default_test_options).ruby_to_mom(source)
       @ins = ret.compilers.find{|c|c.callable.name==:main}.mom_instructions.next
     end
diff --git a/test/vool/class_send/test_class_instance.rb b/test/vool/class_send/test_class_instance.rb
index 397ef5ab..5df7a582 100644
--- a/test/vool/class_send/test_class_instance.rb
+++ b/test/vool/class_send/test_class_instance.rb
@@ -27,7 +27,7 @@ module Vool
     def test_class_inst
       space_class = Parfait.object_space.get_class
       assert_equal :Space , space_class.name
-      names = space_class.singleton_class.instance_type.names
+      names = space_class.single_class.instance_type.names
       assert names.index_of(:inst) , names
     end
     def test_compiler
diff --git a/test/vool/class_send/test_class_send_inherited.rb b/test/vool/class_send/test_class_send_inherited.rb
index 5a0e9ff9..5b526d42 100644
--- a/test/vool/class_send/test_class_send_inherited.rb
+++ b/test/vool/class_send/test_class_send_inherited.rb
@@ -7,7 +7,7 @@ module Vool
 
     def class_main
       <<-eos
-        class Object
+        class Space
           def self.one_plus()
             return 1 + 1
           end
diff --git a/test/vool/lambdas/test_class_blocks.rb b/test/vool/lambdas/test_class_blocks.rb
index d0b0cdc7..a85bfde3 100644
--- a/test/vool/lambdas/test_class_blocks.rb
+++ b/test/vool/lambdas/test_class_blocks.rb
@@ -12,14 +12,16 @@ module VoolBlocks
     def test_block_not_compiles
       source =  "main{|val| val = 0}"
       vool = Ruby::RubyCompiler.compile( as_class_method(source) ).to_vool
+      vool.to_parfait
       begin
         vool.to_mom(nil)
-      rescue => err
+     rescue => err
         assert err.message.include?("Blocks") , err.message
       end
     end
     def test_assign_compiles
       vool = Ruby::RubyCompiler.compile( as_class_method("val = 0") ).to_vool
+      vool.to_parfait
       assert_equal Mom::MomCollection , vool.to_mom(nil).class
     end
   end
diff --git a/test/vool/test_class_expression.rb b/test/vool/test_class_expression.rb
index 04876d4b..6d80f3a4 100644
--- a/test/vool/test_class_expression.rb
+++ b/test/vool/test_class_expression.rb
@@ -2,7 +2,7 @@
 require_relative "helper"
 
 module Vool
-  class TestClassStatement #< MiniTest::Test
+  class TestClassStatement < MiniTest::Test
     include ScopeHelper
     def setup
       Parfait.boot!(Parfait.default_test_options)
@@ -26,7 +26,7 @@ module Vool
       assert_equal :a , @vool.to_parfait.instance_type.names[1]
     end
   end
-  class TestClassStatementTypeCreation #< MiniTest::Test
+  class TestClassStatementTypeCreation < MiniTest::Test
     include ScopeHelper
     def setup
       Parfait.boot!(Parfait.default_test_options)
diff --git a/test/vool/test_class_method_expression.rb b/test/vool/test_class_method_expression.rb
new file mode 100644
index 00000000..bad63df4
--- /dev/null
+++ b/test/vool/test_class_method_expression.rb
@@ -0,0 +1,39 @@
+require_relative "helper"
+
+module Vool
+  class TestClassMethodExpression < MiniTest::Test
+    include VoolCompile
+
+    def class_code
+      "class Space;def self.meth;return 1 ; end;end"
+    end
+    def setup
+      Parfait.boot!(Parfait.default_test_options)
+      ruby_tree = Ruby::RubyCompiler.compile( class_code )
+      @clazz = ruby_tree.to_vool
+    end
+    def method
+      @clazz.body.first
+    end
+    def test_setup
+      assert_equal ClassExpression , @clazz.class
+      assert_equal Statements , @clazz.body.class
+      assert_equal ClassMethodExpression , method.class
+    end
+    def test_fail
+      assert_raises{ method.to_parfait }
+    end
+    def test_method
+      clazz = @clazz.to_parfait
+      assert_equal Parfait::Class , clazz.class
+      meth = method.to_parfait(clazz)
+      assert_equal Parfait::VoolMethod , meth.class
+      assert_equal :meth , meth.name
+    end
+    def test_is_class_method
+      clazz = @clazz.to_parfait
+      m = clazz.single_class.get_instance_method(:meth)
+      assert m , "no method :meth"
+    end
+  end
+end
diff --git a/test/vool/test_method_expression.rb b/test/vool/test_method_expression.rb
index 6d4d8dbb..53bec976 100644
--- a/test/vool/test_method_expression.rb
+++ b/test/vool/test_method_expression.rb
@@ -1,7 +1,7 @@
 require_relative "helper"
 
 module Vool
-  class TestMethodStatement < MiniTest::Test
+  class TestMethodExpression < MiniTest::Test
     include VoolCompile
 
     def setup
@@ -23,7 +23,12 @@ module Vool
     def test_method
       clazz = @clazz.to_parfait
       assert_equal Parfait::Class , clazz.class
-      assert_equal Parfait::VoolMethod , method.to_parfait(clazz).class
+      meth = method.to_parfait(clazz)
+      assert_equal Parfait::VoolMethod , meth.class
+      assert_equal :main , meth.name
+    end
+    def test_is_instance_method
+      assert main = @clazz.to_parfait.get_instance_method(:main)
     end
 
   end