RSpec.describe do

  specify 'mutant should not crash for any node parser can generate' do
    Mutant::AST::Types::ALL.each do |type|
      Mutant::Mutator::REGISTRY.lookup(s(type))
    end
  end
end

RSpec.describe do

  specify 'mutant should not crash for any node parser can generate' do
    Mutant::AST::Types::ALL.each do |type|
      Mutant::Mutator::Registry.lookup(s(type))
    end
  end
end

--- 
+++ 
@@ -2,7 +2,7 @@
 
   specify 'mutant should not crash for any node parser can generate' do
     Mutant::AST::Types::ALL.each do |type|
-      Mutant::Mutator::Registry.lookup(s(type))
+      Mutant::Mutator::REGISTRY.lookup(s(type))
     end
   end
 end
Fix mutator registry use from specs
