1 files changed, 19 insertions, 1 deletions
diff --git a/lib/rubygems/resolver/installed_specification.rb b/lib/rubygems/resolver/installed_specification.rb
index a9438129fb..2a2b89a6c2 100644
--- a/lib/rubygems/resolver/installed_specification.rb
+++ b/lib/rubygems/resolver/installed_specification.rb
@@ -14,7 +14,7 @@ class Gem::Resolver::InstalledSpecification < Gem::Resolver::SpecSpecification
   # This is a null install as this specification is already installed.
   # +options+ are ignored.
 
-  def install options
+  def install options = {}
     yield nil
   end
 
@@ -29,6 +29,24 @@ class Gem::Resolver::InstalledSpecification < Gem::Resolver::SpecSpecification
     super
   end
 
+  def pretty_print q # :nodoc:
+    q.group 2, '[InstalledSpecification', ']' do
+      q.breakable
+      q.text "name: #{name}"
+
+      q.breakable
+      q.text "version: #{version}"
+
+      q.breakable
+      q.text "platform: #{platform}"
+
+      q.breakable
+      q.text 'dependencies:'
+      q.breakable
+      q.pp spec.dependencies
+    end
+  end
+
   ##
   # The source for this specification