fix block initialization

lib/virtual/block.rb

@@ -12,6 +12,7 @@ module Virtual
     def initialize(name , method )
       super()
       @method = method
+      raise "Method is not Method, but #{method.class}" unless method == :dummy or method.is_a?(Parfait::Method)
       @name = name.to_sym
       @branch = nil
       @codes = []

lib/virtual/machine.rb

@@ -123,7 +123,7 @@ module Virtual
         return self
       end
       boot_parfait!
-      @init = Block.new("init",nil)
+      @init = Block.new("init", :dummy )
       @init.add_code Virtual::VirtualMain.new( self.space.get_init )
       @booted = true
       self

lib/virtual/method_source.rb

@@ -46,7 +46,7 @@ module Virtual
     # just passing the method object in for Instructions to make decisions (later)
     def initialize method , return_type = Virtual::Unknown
       # first block we have to create with .new , as new_block assumes a current
-      enter = Block.new( "enter"  , self ).add_code(MethodEnter.new( method ))
+      enter = Block.new( "enter"  , method ).add_code(MethodEnter.new( method ))
       @return_type = return_type
       @blocks = [enter]
       @current = enter
@@ -110,7 +110,7 @@ module Virtual
     # In code generation , the new_block is written after this one, ie zero runtime cost
     # This does _not_ change the insertion point, that has do be done with insert_at(block)
     def new_block new_name
-      new_b = Block.new( new_name , self )
+      new_b = Block.new( new_name , @blocks.first.method )
       index = @blocks.index( @current )
       @blocks.insert( index + 1 , new_b ) # + one because we want the ne after the insert_at
       return new_b