start delegating scope matters to the compiler(s)

slot_type_for to return the slot way to access variable
this is off course version 0.0.1 alpha, no types are checked or errors handled

lib/vool/local_assignment.rb

@@ -3,12 +3,8 @@ module Vool
   class LocalAssignment < Assignment
 
     def to_mom( compiler )
-      if compiler.method.arguments_type.variable_index(@name)
-        type = :arguments
-      else
-        type = :frame
-      end
-      to = Mom::SlotDefinition.new(:message ,[ type , @name])
+      slot_def = compiler.slot_type_for(@name)
+      to = Mom::SlotDefinition.new(:message ,slot_def)
       from = @value.slot_definition(compiler)
       return chain_assign( Mom::SlotLoad.new(to,from) , compiler)
     end