Fix invalid ast generation on index sends

lib/mutant/mutator/node/send.rb

@@ -9,15 +9,70 @@ module Mutant
 
         children :receiver, :selector
 
+        INDEX_REFERENCE = :[]
+        INDEX_ASSIGN    = :[]=
+        ASSIGN_SUFFIX   = :'='
+
+        # Base mutator for index operations
+        class Index < self
+
+          # Mutator for index references
+          class Reference < self
+
+            # Perform dispatch
+            #
+            # @return [undefined]
+            #
+            # @api private
+            #
+            def dispatch
+              emit(receiver)
+            end
+
+          end # Reference
+
+          # Mutator for index assignments
+          class Assign < self
+
+            # Perform dispatch
+            #
+            # @return [undefined]
+            #
+            # @api private
+            #
+            def dispatch
+              emit(receiver)
+            end
+
+          end # Assign
+        end # Index
+
       private
 
-        # Emit mutations
+        # Perform dispatch
         #
         # @return [undefined]
         #
         # @api private
         #
         def dispatch
+          case selector
+          when INDEX_REFERENCE
+            run(Index::Reference)
+          when INDEX_ASSIGN
+            run(Index::Assign)
+          else
+            non_index_dispatch
+          end
+        end
+
+        # Perform non index dispatch
+        #
+        # @return [undefined]
+        #
+        # @api private
+        #
+        def non_index_dispatch
           if binary_operator?
             run(Binary)
             return

lib/mutant/reporter/cli/printer/subject.rb

@@ -19,6 +19,7 @@ module Mutant
             info(object.identification)
           end
 
+          # Prunter for subject runners
           class Runner < self
 
             handle(Mutant::Runner::Subject)
@@ -64,7 +65,6 @@ module Mutant
             # @api private
             #
             def print_stats
-              p coverage
               status('(%02d/%02d) %3d%% - %0.02fs', amount_kills, amount_mutations, coverage, time)
             end
 

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

@@ -3,6 +3,18 @@ require 'spec_helper'
 # FIXME: This spec needs to be structured better!
 describe Mutant::Mutator, 'send' do
 
+  context 'index assign' do
+    let(:source) { 'foo[bar]=baz' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'foo'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+
+
   context 'with only a splat arg' do
     let(:source) { 'foo(*bar)' }