Fix propagation of splat args

Closes #39

lib/mutant/mutator/node/noop.rb

@@ -9,12 +9,8 @@ module Mutant
           :self, :zsuper, :not, :or, :and, :defined,
           :next, :break, :match, :gvar, :cvar, :ensure, :rescue,
           :dstr, :dsym, :yield, :begin, :rescue, :gvasgn,
-          :lvar,
+          :lvar, :splat, :const, :blockarg, :block_pass,
-          :const,
+          :ivar, :restarg
-          :blockarg,
-          :block_pass,
-          :ivar,
-          :restarg
         )
 
       private

lib/mutant/mutator/node/send/binary.rb

@@ -19,7 +19,7 @@ module Mutant
           def dispatch
             emit(left)
             emit_left_mutations
-            emit(right)
+            emit(right) unless right.type == :splat
             emit_right_mutations
           end
 

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

@@ -12,6 +12,17 @@ describe Mutant::Mutator, 'send' do
     end
   end
 
+  context 'single splat arg splat' do
+    let(:source) { 'foo[*bar]' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'foo'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+
   context 'with self as' do
     context 'implicit' do
       let(:source) { 'foo' }