small cleanup

lib/vool/compiler.rb

@@ -190,8 +190,9 @@ module Vool
     private
 
     def simplify_condition( cond )
-      return unless cond.condition.is_a?(ScopeStatement)
-      cond.condition = cond.condition.first if cond.condition.single?
+      condition = cond.condition
+      return unless condition.is_a?(ScopeStatement)
+      cond.condition = condition.first if condition.single?
     end
 
     def instance_name sym

lib/vool/statements.rb

@@ -13,6 +13,9 @@ module Vool
     def first
       @statements.first
     end
+    def length
+      @statements.length
+    end
   end
 
   class ScopeStatement < Statements