Fix emit of naked splat

[Fix #724]

lib/mutant/mutator/node/literal/array.rb

@@ -9,6 +9,8 @@ module Mutant
 
           handle(:array)
 
+          children :first
+
         private
 
           # Emit mutations
@@ -19,7 +21,7 @@ module Mutant
             emit_type
             mutate_body
             return unless children.one?
-            emit(children.first)
+            emit(first) unless n_splat?(first)
           end
 
           # Mutate body

meta/lvasgn.rb

@@ -8,3 +8,18 @@ Mutant::Meta::Example.add :lvasgn do
   mutation 'a = false'
   mutation 'a = nil'
 end
+
+Mutant::Meta::Example.add :array, :lvasgn do
+  source 'a = *b'
+
+  singleton_mutations
+  mutation 'a__mutant__ = *b'
+  mutation 'a = nil'
+  mutation 'a = self'
+  mutation 'a = []'
+  mutation 'a = [nil]'
+  mutation 'a = [self]'
+  mutation 'a = [*self]'
+  mutation 'a = [*nil]'
+  mutation 'a = [b]'
+end