lib/pycall/pyerror.rb in pycall-0.1.0.alpha.20170311 vs lib/pycall/pyerror.rb in pycall-0.1.0.alpha.20170317

@@ -22,10 +22,10 @@
 
     attr_reader :type, :value, :traceback
 
     def to_s
       "#{type}: #{value}".tap do |msg|
-        unless traceback&.null?
+        unless traceback.nil? || traceback.null?
           if (o = PyCall.format_traceback(traceback))
             msg.concat("\n", *o)
           end
         end
       end