Avoid mutating break to next

Closes #201

config/flay.yml

@@ -1,3 +1,3 @@
 ---
 threshold: 18
-total_score: 869
+total_score: 883

lib/mutant.rb

@@ -156,7 +156,8 @@ require 'mutant/mutator/node/kwbegin'
 require 'mutant/mutator/node/named_value/access'
 require 'mutant/mutator/node/named_value/constant_assignment'
 require 'mutant/mutator/node/named_value/variable_assignment'
-require 'mutant/mutator/node/loop_control'
+require 'mutant/mutator/node/next'
+require 'mutant/mutator/node/break'
 require 'mutant/mutator/node/noop'
 require 'mutant/mutator/node/or_asgn'
 require 'mutant/mutator/node/and_asgn'

lib/mutant/mutator/node/break.rb

@@ -0,0 +1,29 @@
+# encoding: utf-8
+
+module Mutant
+  class Mutator
+    class Node
+
+      # Mutator for loop control keywords
+      class Break < Generic
+
+        handle(:break)
+
+      private
+
+        # Emit mutations
+        #
+        # @return [undefined]
+        #
+        # @api private
+        #
+        def dispatch
+          super
+          emit_singletons
+          children.each_index(&method(:delete_child))
+        end
+
+      end # Break
+    end # Node
+  end # Mutator
+end # Mutant

lib/mutant/mutator/node/next.rb

@@ -5,14 +5,9 @@ module Mutant
     class Node
 
       # Mutator for loop control keywords
-      class LoopControl < Generic
+      class Next < Generic
 
-        INVERSE = IceNine.deep_freeze(
-          next: :break,
-          break: :next
-        )
-
-        handle(*INVERSE.keys)
+        handle(:next)
 
       private
 
@@ -26,10 +21,11 @@ module Mutant
           super
           emit_singletons
           children.each_index(&method(:delete_child))
-          emit(s(INVERSE.fetch(node.type), *children))
+          emit(s(:break, *children))
         end
 
       end # Next
     end # Node
   end # Mutator
 end # Mutant
+

meta/break.rb

@@ -7,5 +7,4 @@ Mutant::Meta::Example.add do
   mutation 'break false'
   mutation 'break nil'
   mutation 'break'
-  mutation 'next true'
 end