Fixing self type creation

When compiling a classs, we pick up all instance variables.
Now that conditions and returns can be calls, that was broken, now fixed

lib/vool/while_statement.rb

@@ -23,7 +23,7 @@ module Vool
 
     def each(&block)
       block.call(self)
-      block.call(@condition)
+      @condition.each(&block)
       @hoisted.each(&block) if @hoisted
       @body.each(&block)
     end