lib/nydp/symbol_lookup.rb in nydp-0.3.0 vs lib/nydp/symbol_lookup.rb in nydp-0.4.0

@@ -3,19 +3,19 @@
 module Nydp
   class SymbolLookup
     extend Helper
 
     def self.skip_empty bindings
-      while Nydp::NIL.isnt?(bindings) && bindings.car.empty?
+      while (NIL != bindings) && bindings.car.empty?
         bindings = bindings.cdr
       end
       bindings
     end
 
     def self.build name, bindings
       bindings = skip_empty bindings
       depth = 0
-      while Nydp::NIL.isnt? bindings
+      while NIL != bindings
         here = bindings.car
         if here.key? name
           binding_index = here[name]
           return ContextSymbol.build(depth, name, binding_index)
         else