lib/regexp_parser/syntax/base.rb in regexp_parser-2.2.0 vs lib/regexp_parser/syntax/base.rb in regexp_parser-2.2.1

@@ -1,7 +1,5 @@
-require 'set'
-
 module Regexp::Syntax
   class NotImplementedError < Regexp::Syntax::SyntaxError
     def initialize(syntax, type, token)
       super "#{syntax.class.name} does not implement: [#{type}:#{token}]"
     end
@@ -21,18 +19,18 @@
     def features
       @implements
     end
 
     def implementations(type)
-      @implements[type] ||= Set.new
+      @implements[type] ||= []
     end
 
     def implements(type, tokens)
-      implementations(type).merge(Array(tokens))
+      implementations(type).concat(Array(tokens))
     end
 
     def excludes(type, tokens)
-      implementations(type).subtract(Array(tokens))
+      Array(tokens).each { |tok| implementations(type).delete(tok) }
     end
 
     def implements?(type, token)
       implementations(type).include?(token)
     end