lib/must/rule.rb in maiha-must-0.1 vs lib/must/rule.rb in maiha-must-0.2

@@ -1,5 +1,7 @@
+require 'set'
+
 module Must
   class Rule
     attr_reader :object
 
     def initialize(object)
@@ -22,11 +24,11 @@
         valid?(object == args.shift, &block)
       end
     end
 
     def empty(&block)
-      valid?(object.blank?, &block)
+      valid?(object.empty?, &block)
     end
 
     def blank(&block)
       valid?(object.blank?, &block)
     end
@@ -36,10 +38,10 @@
       be(nil, &block)
     end
 
     def kind_of(*targets)
       valid?(targets.any?{|klass| object.is_a? klass}) {
-        target = targets.map(&:name).join('/')
+        target = targets.map{|i| i.name}.join('/')
         raise Invalid, "expected #{target} but got #{object.class}"
       }
     end
 
     def one_of(target, &block)