lib/ravensat/ast/or_node.rb in ravensat-1.0.8 vs lib/ravensat/ast/or_node.rb in ravensat-1.0.9

@@ -1,8 +1,10 @@
 module Ravensat
   class OrNode < OprNode
     def |(object)
       raise TypeError.new("#{object.class} can't be coerced into Ravensat::Node") unless object.is_a? Node
+      return self if object.is_a? NilNode
+
       @children.append object
       self
     end
 
     def cnf?