diff --git a/lib/register/builtin/kernel.rb b/lib/register/builtin/kernel.rb
index 7648ba0c..cda39cdf 100644
--- a/lib/register/builtin/kernel.rb
+++ b/lib/register/builtin/kernel.rb
@@ -10,7 +10,7 @@ module Builtin
         function.info.return_type = Virtual::Integer
         main = Virtual.machine.space.get_main
         me = Virtual::Self.new(Virtual::Reference)
-        code = Virtual::Set.new(Virtual::Self.new(me.type), me)
+        code = Virtual::Set.new(me , Virtual::Self.new(me.type))
         function.info.add_code(code)
         function.info.add_code Virtual::MethodCall.new(main)
         return function
diff --git a/lib/virtual/compiler/basic_expressions.rb b/lib/virtual/compiler/basic_expressions.rb
index 220be0ba..add6d6a9 100644
--- a/lib/virtual/compiler/basic_expressions.rb
+++ b/lib/virtual/compiler/basic_expressions.rb
@@ -15,25 +15,25 @@ module Virtual
       def self.compile_integer expression , method
         int = expression.value
         to = Return.new(Integer , int)
-        method.info.add_code Set.new( to , int)
+        method.info.add_code Set.new( int , to )
         to
       end
 
       def self.compile_true expression , method
         to = Return.new(Reference , true )
-        method.info.add_code Set.new( to , true )
+        method.info.add_code Set.new( true , to )
         to
       end
 
       def self.compile_false expression , method
         to = Return.new(Reference , false)
-        method.info.add_code Set.new( to , false )
+        method.info.add_code Set.new( false , to )
         to
       end
 
       def self.compile_nil expression , method
         to = Return.new(Reference , nil)
-        method.info.add_code Set.new( to , nil )
+        method.info.add_code Set.new( nil , to )
         to
       end
 
@@ -62,7 +62,7 @@ module Virtual
         clazz = Space.space.get_class_by_name name
         raise "uups #{clazz}.#{name}" unless clazz
         to = Return.new(Reference , clazz )
-        method.info.add_code Set.new( to , clazz )
+        method.info.add_code Set.new( clazz , to )
         to
       end
 
@@ -72,7 +72,7 @@ module Virtual
         value = expression.string.to_sym
         to = Return.new(Reference , value)
         method.info.constants << value
-        method.info.add_code Set.new( to , value )
+        method.info.add_code Set.new( value , to )
         to
       end
 
@@ -85,10 +85,10 @@ module Virtual
         raise "oh noo, nil from where #{expression.right.inspect}" unless r
         index = method.has_arg(expression.left.name.to_sym)
         if index
-          method.info.add_code Set.new(Return.new , MessageSlot.new(index , r,type , r ))
+          method.info.add_code Set.new(MessageSlot.new(index , r,type , r ) , Return.new)
         else
           index = method.ensure_local(expression.left.name.to_sym)
-          method.info.add_code Set.new(Return.new , FrameSlot.new(index , r.type , r ))
+          method.info.add_code Set.new(FrameSlot.new(index , r.type , r ) , Return.new)
         end
         r
       end
diff --git a/lib/virtual/compiler/callsite_expression.rb b/lib/virtual/compiler/callsite_expression.rb
index c8720f5d..09b8d3d2 100644
--- a/lib/virtual/compiler/callsite_expression.rb
+++ b/lib/virtual/compiler/callsite_expression.rb
@@ -7,8 +7,8 @@ module Virtual
     def self.compile_callsite expession , method
       me = Compiler.compile( expession.receiver , method )
       method.info.add_code NewMessage.new
-      method.info.add_code Set.new(NextSelf.new(me.type), me)
-      method.info.add_code Set.new(NextMessageName.new(), expession.name.to_sym)
+      method.info.add_code Set.new( me , NextSelf.new(me.type))
+      method.info.add_code Set.new( expession.name.to_sym , NextMessageName.new())
       compiled_args = []
       expession.args.each_with_index do |arg , i|
         #compile in the running method, ie before passing control
@@ -16,7 +16,7 @@ module Virtual
         # move the compiled value to it's slot in the new message
         to = NextMessageSlot.new(i ,val.type , val)
         # (doing this immediately, not after the loop, so if it's a return it won't get overwritten)
-        method.info.add_code Set.new(to , val )
+        method.info.add_code Set.new( val , to )
         compiled_args << to
       end
       method.info.add_code MessageSend.new(expession.name , me , compiled_args) #and pass control
diff --git a/lib/virtual/instructions/set.rb b/lib/virtual/instructions/set.rb
index 955610ce..b43e5230 100644
--- a/lib/virtual/instructions/set.rb
+++ b/lib/virtual/instructions/set.rb
@@ -5,9 +5,9 @@ module Virtual
   # these are represented as slots  (see there)
   # from may be a Constant (Object,Integer,String,Class)
   class Set < Instruction
-    def initialize to , from
-      @to = to
+    def initialize from , to
       @from = from
+      @to = to
     end
     attr_reader :from , :to
   end
diff --git a/lib/virtual/slots/slot.rb b/lib/virtual/slots/slot.rb
index 3f20514c..28599da0 100644
--- a/lib/virtual/slots/slot.rb
+++ b/lib/virtual/slots/slot.rb
@@ -37,4 +37,4 @@ end
 require_relative "message_slot"
 require_relative "self_slot"
 require_relative "frame_slot"
-require_relative "new_message_slot"
+require_relative "next_message_slot"