lib/mail/vendor/treetop-1.4.3/examples/lambda_calculus/arithmetic.rb in mail-1.5.0 vs lib/mail/vendor/treetop-1.4.3/examples/lambda_calculus/arithmetic.rb in mail-1.5.1

@@ -1,9 +1,9 @@
 module Arithmetic
   include Treetop::Runtime
   
   def root
-    @root || :expression
+    @root ||= :expression
   end
   
   def _nt_expression
     start_index = index
     cached = node_cache[:expression][index]