lib/ravensat/ast/and_node.rb in ravensat-1.0.6 vs lib/ravensat/ast/and_node.rb in ravensat-1.0.7

@@ -1,7 +1,8 @@
 module Ravensat
   class AndNode < OprNode
     def &(object)
+      raise TypeError.new("#{object.class} can't be coerced into Ravensat::Node") unless object.is_a? Node
       @children.append object
       self
     end
 
     def to_dimacs