ensure shared examples name is marshaled as string

features/rspec.feature

@@ -33,3 +33,29 @@ Feature: rspec task
       """
       # ./spec/spec_spec.rb:2:in `block (2 levels) in <top (required)>'
       """
+
+  Scenario: it behaves like
+    Given the following spec:
+      """
+      class Rick
+        def drunk?
+          true
+        end
+      end
+
+      class PickleRick < Rick
+      end
+
+      shared_examples_for Rick do
+        it('drinks') { expect(subject).to be_drunk }
+      end
+
+      describe PickleRick do
+        it_behaves_like Rick
+      end
+      """
+    When I run flatware with "rspec"
+    Then the output contains the following:
+      """
+      1 example, 0 failures
+      """

lib/flatware/rspec/marshalable/example.rb

@@ -1,6 +1,8 @@
 module Flatware
   module RSpec
     module Marshalable
+      require 'flatware/rspec/marshalable/shared_group_inclusion_backtrace'
+
       ##
       # a subset of the rspec example interface that can traverse drb
       Example = Struct.new(
@@ -16,10 +18,21 @@ def initialize(rspec_example)
             rspec_example.public_send(attribute)
           end)
 
-          @metadata = rspec_example.metadata.slice(:extra_failure_lines, :shared_group_inclusion_backtrace)
+          @metadata = marshalable_metadata(rspec_example.metadata)
         end
 
         attr_reader :metadata
+
+        private
+
+        def marshalable_metadata(rspec_metadata)
+          rspec_metadata.slice(:extra_failure_lines).tap do |metadata|
+            if (backtraces = rspec_metadata[:shared_group_inclusion_backtrace])
+              metadata[:shared_group_inclusion_backtrace] =
+                backtraces.map(&SharedGroupInclusionBacktrace.method(:from_rspec))
+            end
+          end
+        end
       end
     end
   end

lib/flatware/rspec/marshalable/shared_group_inclusion_backtrace.rb

@@ -0,0 +1,11 @@
+module Flatware
+  module RSpec
+    module Marshalable
+      class SharedGroupInclusionBacktrace < ::RSpec::Core::SharedExampleGroupInclusionStackFrame
+        def self.from_rspec(backtrace)
+          new(backtrace.shared_group_name.to_s, backtrace.inclusion_location)
+        end
+      end
+    end
+  end
+end