ext/objspace: Check fptr before trying to dump FILE object fd

Patch by Scott Francis. Closes GH-562.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45308 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 0 deletions

diff --git a/test/objspace/test_objspace.rb b/test/objspace/test_objspace.rb
index 42dc55de9f..ea89a87e18 100644
--- a/test/objspace/test_objspace.rb
+++ b/test/objspace/test_objspace.rb
@@ -266,4 +266,15 @@ class TestObjSpace < Test::Unit::TestCase
       File.unlink(output)
     end
   end
+
+  def test_dump_uninitialized_file
+    assert_in_out_err(%[-robjspace], <<-RUBY) do |output, error|
+      puts ObjectSpace.dump(File.allocate)
+    RUBY
+      assert_equal [], error
+      json = JSON.load(output.join)
+      assert_equal "FILE", json["type"]
+      assert_nil json["fd"]
+    end
+  end
 end