retiring ClassField and class_field from typed layer

Creating classes is the responsibility of melon

lib/typed/compiler.rb

@@ -2,7 +2,7 @@ require_relative "tree"
 
 module Typed
 
-  CompilerModules = [ "assignment" , "basic_values" , "call_site", "class_field" ,
+  CompilerModules = [ "assignment" , "basic_values" , "call_site", 
                       "class_statement" , "collections" , "field_def" , "field_access",
                       "function_statement" , "if_statement" , "name_expression" ,
                       "operator_expression" , "return_statement", "statement_list",
@@ -92,7 +92,7 @@ module Typed
     # class_name and method_name are pretty clear, args are given as a ruby array
     def create_method( class_name , method_name , args = {})
       raise "create_method #{class_name}.#{class_name.class}" unless class_name.is_a? Symbol
-      clazz = Register.machine.space.get_class_by_name class_name
+      clazz = Register.machine.space.get_class_by_name! class_name
       raise "No such class #{class_name}" unless clazz
       create_method_for( clazz.instance_type , method_name , args)
     end

lib/typed/compiler/class_field.rb

@@ -1,18 +0,0 @@
-module Typed
-  module ClassField
-
-    def on_ClassField statement
-      #type , name , value = *statement
-
-      for_type = @type
-      raise "no type" unless for_type
-      index = for_type.variable_index(statement.name)
-      raise "class field already defined:#{name} for class #{for_type}" if index
-
-      #FIXME should not hack into current type, but create a new
-      for_type.send(:private_add_instance_variable, statement.name , statement.type)
-
-      return nil # statements don't reurn values, only expressions
-    end
-  end
-end

lib/typed/tree/to_code.rb

@@ -49,14 +49,6 @@ module Typed
       w
     end
 
-    def on_class_field statement
-      type , name = *statement
-      w = Tree::ClassField.new()
-      w.type = type
-      w.name = name
-      w
-    end
-
     def on_while_statement statement
       branch_type , condition , statements = *statement
       w = Tree::WhileStatement.new()