ContractError should also show the arguments that caused the error

lib/contracts.rb

@@ -111,7 +111,7 @@ def to_s
     ("#{args} => #{ret}").gsub("Contracts::Builtin::", "")
   end
 
-  # Given a hash, prints out a failure message.
+  # Given a hash, returns a failure message.
   # This function is used by the default #failure_callback method
   # and uses the hash passed into the failure_callback method.
   def self.failure_msg(data)
@@ -130,6 +130,7 @@ def self.failure_msg(data)
         Actual: #{data[:arg].inspect}
         Value guarded in: #{data[:class]}::#{method_name}
         With Contract: #{data[:contracts]}
+        All arguments: #{data[:args].inspect}
         At: #{position} }
   end
 

lib/contracts/call_with.rb

@@ -23,6 +23,7 @@ def call_with(this, *args, &blk)
                                                   :contracts => self,
                                                   :arg_pos => i+1,
                                                   :total_args => args.size,
+                                                  :args => args,
                                                   :return_value => false)
         end
 
@@ -56,6 +57,7 @@ def call_with(this, *args, &blk)
                                                     :contracts => self,
                                                     :arg_pos => i-1,
                                                     :total_args => args.size,
+                                                    :args => args,
                                                     :return_value => false)
           end
 
@@ -82,6 +84,7 @@ def call_with(this, *args, &blk)
                                   :class => klass,
                                   :method => method,
                                   :contracts => self,
+                                  :args => args,
                                   :return_value => true)
       end