Add explicit mutator for restarg

lib/mutant.rb

@@ -71,6 +71,7 @@ require 'mutant/mutator/node/noop'
 require 'mutant/mutator/node/while'
 require 'mutant/mutator/node/super'
 require 'mutant/mutator/node/zsuper'
+require 'mutant/mutator/node/restarg'
 require 'mutant/mutator/node/send'
 require 'mutant/mutator/node/send/binary'
 require 'mutant/mutator/node/when'

lib/mutant/mutator/node/generic.rb

@@ -13,7 +13,7 @@ module Mutant
           :next, :break, :ensure,
           :dstr, :dsym, :yield, :rescue, :redo, :defined?,
           :blockarg, :op_asgn, :and_asgn,
-          :regopt, :restarg, :resbody, :retry, :arg_expr,
+          :regopt, :resbody, :retry, :arg_expr,
           :kwrestarg, :kwoptarg, :kwarg, :undef, :module, :empty,
           :alias, :for, :xstr, :back_ref, :class,
           :sclass, :match_with_lvasgn, :match_current_line, :or_asgn, :kwbegin

lib/mutant/mutator/node/restarg.rb

@@ -0,0 +1,15 @@
+# encoding: utf-8
+
+module Mutant
+  class Mutator
+    class Node
+
+      # Restarg mutator
+      class Restarg < Generic
+
+        handle(:restarg)
+
+      end # Restarg
+    end # Node
+  end # Mutator
+end # Mutant

spec/unit/mutant/mutator/node/restarg/mutation_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Mutant::Mutator::Node::Generic, 'restarg' do
+describe Mutant::Mutator::Node::Restarg, 'restarg' do
   let(:source) { 'foo(*bar)' }
 
   let(:mutations) do