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

lib/ruby/statements.rb

@@ -0,0 +1,55 @@
+module Ruby
+  class Statements < Statement
+    attr_reader :statements
+    def initialize(statements)
+      @statements = statements
+    end
+
+    def empty?
+      @statements.empty?
+    end
+    def single?
+      @statements.length == 1
+    end
+    def first
+      @statements.first
+    end
+    def last
+      @statements.last
+    end
+    def length
+      @statements.length
+    end
+    def [](i)
+      @statements[i]
+    end
+    def <<(o)
+      @statements << o
+      self
+    end
+
+    # create mom instructions
+    def to_mom( compiler )
+      raise "Empty list ? #{statements.length}" if empty?
+      stats = @statements.dup
+      flat = stats.shift.to_mom(compiler)
+      while( nekst = stats.shift )
+        flat.append nekst.to_mom(compiler)
+      end
+      flat
+    end
+
+    def each(&block)
+      block.call(self)
+      @statements.each{|a| a.each(&block)}
+    end
+
+    def to_s(depth = 0)
+      at_depth(depth , *@statements.collect{|st| st.to_s(depth)})
+    end
+
+  end
+
+  class ScopeStatement < Statements
+  end
+end