Fix vool assignments after call rework

also small fix for if and return, as they need to execute sneds and yields (not just sends), so testing for Call not SendStatement

lib/ruby/return_statement.rb

@@ -9,10 +9,10 @@ module Ruby
     end
 
     def to_vool
-      val , rest = *normalize_name(@return_value)
-      me = Vool::ReturnStatement.new(val.to_vool)
-      return me unless rest
-      Vool::Statements.new([ rest.to_vool , me])
+      val , hoisted = *normalized_vool(@return_value)
+      me = Vool::ReturnStatement.new(val)
+      return me unless hoisted
+      Vool::Statements.new( hoisted ) << me
     end
 
     def to_s(depth = 0)

lib/vool/assignment.rb

@@ -1,5 +1,10 @@
 module Vool
 
+  # Base class for assignments (local/ivar), works just as you'd expect
+  # Only "quirk" maybe, that arguments are like locals
+  #
+  # Only actual functionality here is the compile_assign_call which compiles
+  # the call, should the assigned value be a call.
   class Assignment < Statement
     attr_reader :name , :value
     def initialize(name , value )
@@ -19,9 +24,18 @@ module Vool
       at_depth(depth , "#{@name} = #{@value}")
     end
 
-    def chain_assign(assign , compiler)
+    # The assign instruction (a slot_load) is produced by delegating the slot to derived
+    # class
+    #
+    # When the right hand side is a CallStatement, it must be compiled, before the assign
+    # is executed
+    #
+    # Derived classes do not implement to_mom, only slot_position
+    def to_mom(compiler)
+      to = Mom::SlotDefinition.new(:message , self.slot_position(compiler))
+      from = @value.slot_definition(compiler)
+      assign = Mom::SlotLoad.new(self,to,from)
       return assign unless @value.is_a?(CallStatement)
-      raise "Move me to ruby layer"
       @value.to_mom(compiler) << assign
     end
   end

lib/vool/if_statement.rb

@@ -16,7 +16,7 @@ module Vool
       merge_label = Mom::Label.new( self , "merge_label_#{object_id.to_s(16)}")
 
       check =  Mom::TruthCheck.new(condition.slot_definition(compiler) , false_label)
-      if @condition.is_a?(SendStatement)
+      if @condition.is_a?(CallStatement)
         head = @condition.to_mom(compiler)
         head << check
       else

lib/vool/ivar_assignment.rb

@@ -3,13 +3,16 @@ module Vool
   class IvarAssignment < Assignment
 
     def to_s(depth = 0)
-      "@#{super(depth)}"
+      at_depth(depth,"@#{super(0)}")
     end
 
-    def to_mom( compiler )
-      to = Mom::SlotDefinition.new(:message ,[ :receiver , @name])
-      from = @value.slot_definition(compiler)
-      return chain_assign( Mom::SlotLoad.new(self,to,from) , compiler)
+    # We return the position where the local is stored. This is an array, giving the
+    # position relative to :message- A SlotLoad is constructed from this.
+    #
+    # As we know it is a instance variable, it is stored in the :receiver , and has
+    # the name @name
+    def slot_position( compiler )
+      [ :receiver , @name]
     end
 
   end

lib/vool/local_assignment.rb

@@ -1,12 +1,16 @@
 module Vool
 
+  # Local assignment really only differs in where the variable is actually stored,
+  # slot_position defines that
   class LocalAssignment < Assignment
 
-    def to_mom( compiler )
-      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(self,to,from) , compiler)
+    # We return the position where the local is stored. This is an array, giving the
+    # position relative to :message- A SlotLoad is constructed from this.
+    #
+    # Only snag is that we do not know this position, as only the compiler knows
+    # if the variable name is a local or an arg. So we delegate to the compiler.
+    def slot_position( compiler )
+      compiler.slot_type_for(@name)
     end
 
   end

lib/vool/return_statement.rb

@@ -18,7 +18,7 @@ module Vool
     def to_mom( compiler )
       load = Mom::SlotLoad.new( self , [:message , :return_value] ,
                         @return_value.slot_definition(compiler) )
-      if @return_value.is_a?(SendStatement)
+      if @return_value.is_a?(CallStatement)
         ret = @return_value.to_mom(compiler)
         ret << load
       else

lib/vool/statements.rb

@@ -2,7 +2,18 @@ module Vool
   class Statements < Statement
     attr_reader :statements
     def initialize(statements)
-      @statements = statements
+      case statements
+      when nil
+        @statements = []
+      when Array
+        @statements = statements
+      when Statement
+        @statements = statements.statements
+      when Statement
+        @statements = [statements]
+      else
+        raise "Invalid class, must be Statement or Array, not #{statements.class}"
+      end
     end
 
     def empty?
@@ -24,7 +35,11 @@ module Vool
       @statements[i]
     end
     def <<(o)
-      @statements << o
+      if(o.is_a?(Statements))
+        o.each {|s| @statements << s }
+      else
+        @statements << o
+      end
       self
     end
     def prepend(o)