853_debug.patch

diff --git a/lib/rubygems/request_set.rb b/lib/rubygems/request_set.rb
index 9cde81d..3b026a1 100644
--- a/lib/rubygems/request_set.rb
+++ b/lib/rubygems/request_set.rb
@@ -331,8 +331,11 @@ class Gem::RequestSet
       unless match then
         next if dep.type == :development and @development_shallow
         next if @soft_missing
+
+        request_spec_names = @requests.map { |r| r.spec.full_name }
+
         raise Gem::DependencyError,
-              "Unresolved dependency found during sorting - #{dep} (requested by #{node.spec.full_name})"
+              "Unresolved dependency found during sorting - #{dep} (requested by #{node.spec.full_name}, have #{request_spec_names.join ', '})"
       end
 
       begin