Mutant crash on 39cd9d72d of cstorey/srsrb.

gistfile1.txt

Mutant configuration:
Matcher:   #<Mutant::Matcher::Method::Instance identification="SRSRB::CardEditorApp#card_models_as_dictionary">
Filter:    Mutant::Mutation::Filter::ALL
Strategy:  #<Mutant::Strategy::Rspec::Full>
Subject: SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110
Alive: rspec:noop:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:24ec0 (0.71s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:3e242 (0.43s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:5d14b (0.43s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:3aca1 (0.42s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:d8c97 (0.45s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:1b433 (0.45s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:d8768 (0.43s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:14378 (0.42s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:b1a82 (0.43s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:20cbc (0.44s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:03787 (0.43s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:d6f09 (0.44s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:4f860 (0.42s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:79784 (0.41s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:b1010 (0.42s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:64cc2 (0.43s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:692e1 (0.41s)
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:376b1 (0.42s)
/Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/registry.rb:43:in `block in lookup': No mutator to handle: NilClass (ArgumentError)
  from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/registry.rb:42:in `fetch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/registry.rb:42:in `lookup'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:17:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/send/binary_operator_method.rb:53:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/send/binary_operator_method.rb:53:in `emit_right_mutations'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/send/binary_operator_method.rb:19:in `dispatch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:70:in `initialize'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:192:in `run'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/send/with_arguments.rb:23:in `dispatch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:70:in `initialize'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:17:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node.rb:103:in `emit_attribute_mutations'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/iter_19.rb:16:in `dispatch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:70:in `initialize'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:17:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node.rb:103:in `emit_attribute_mutations'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/send.rb:45:in `emit_block_mutations'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/send.rb:22:in `dispatch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:70:in `initialize'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:17:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/util/array.rb:45:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/util/array.rb:45:in `block in dispatch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/util/array.rb:43:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/util/array.rb:43:in `each_with_index'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/util/array.rb:43:in `dispatch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:70:in `initialize'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:192:in `run'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/util/array.rb:63:in `dispatch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:70:in `initialize'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:17:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node.rb:103:in `emit_attribute_mutations'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/block.rb:19:in `dispatch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:70:in `initialize'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:17:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node.rb:103:in `emit_attribute_mutations'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/define.rb:18:in `dispatch'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:70:in `initialize'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/abstract_type-0.0.5/lib/abstract_type.rb:40:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator.rb:17:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/subject.rb:42:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/runner.rb:89:in `run_subject'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/runner.rb:75:in `block in run'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/matcher/method.rb:39:in `block in each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/matcher/method.rb:38:in `tap'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/matcher/method.rb:38:in `each'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/runner.rb:73:in `run'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/runner.rb:52:in `initialize'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/adamantium-0.0.7/lib/adamantium/class_methods.rb:17:in `new'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/support/method_object.rb:28:in `run'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/cli.rb:22:in `run'
	from /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/bin/mutant:14:in `<top (required)>'
	from bin/mutant:16:in `load'
	from bin/mutant:16:in `<main>'
Killed: rspec:SRSRB::CardEditorApp#card_models_as_dictionary:/Users/cez/projects/srs-rb/lib/srsrb/rackapp.rb:110:86219 (0.42s)
#<Mutant::Mutator::Node::Send::BinaryOperatorMethod:0x007fd2c5b0bc48 @block=#<Method: Mutant::Mutator::Node::Send::WithArguments(Mutant::Mutator)#emit>, @input=#<Rubinius::AST::SendWithArguments:0x007fd2c5fc2a70 @line=113, @receiver=#<Rubinius::AST::ToplevelConstant:0x007fd2c5fc2ae8 @line=113, @name=:Hash>, @name=:[], @privately=false, @block=nil, @check_for_local=false, @vcall_style=false, @arguments=#<Rubinius::AST::ActualArguments:0x007fd2c5fc2a48 @line=113, @splat=#<Rubinius::AST::SplatValue:0x007fd2c5fc2a98 @line=113, @value=#<Rubinius::AST::LocalVariableAccess:0x007fd2c5fc2ac0 @line=113, @name=:kvs, @variable=nil>>, @array=[]>>, @seen=#<Set: {"::Hash[*kvs]"}>>

hack.patch

ant-0.2.20/lib/mutant/mutator/node/send/binary_operator_method.rb
--- lib/mutant/mutator/node/send/binary_operator_method.rb  2013-04-07 11:10:48.000000000 +0100
+++ /Users/cez/.gem/ruby/1.9.3/gems/mutant-0.2.20/lib/mutant/mutator/node/send/binary_operator_method.rb	2013-04-07 11:11:20.000000000 +0100
@@ -16,8 +16,15 @@
           #
           def dispatch
             emit_left_mutations
-            emit_right_mutations
-            emit(right)
+            if right
+              emit_right_mutations
+              emit(right)
+            else
+              emit(node.arguments)
+            end
+          rescue ArgumentError
+            puts self.inspect
+            raise
           end

           # Emit left mutations