struct.c: dig

* object.c (rb_obj_dig): dig in nested structs too.
* struct.c (rb_struct_dig): new method Struct#dig.
  [Feature #11688]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52596 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/test/ruby/test_struct.rb b/test/ruby/test_struct.rb
index f51432cfd6..780d344b8e 100644
--- a/test/ruby/test_struct.rb
+++ b/test/ruby/test_struct.rb
@@ -353,6 +353,13 @@ module TestStruct
     assert_equal "[Bug #9353]", x.send(:a=, "[Bug #9353]")
   end
 
+  def test_dig
+    klass = @Struct.new(:a)
+    o = klass.new(klass.new({b: [1, 2, 3]}))
+    assert_equal(1, o.dig(:a, :a, :b, 0))
+    assert_nil(o.dig(:b, 0))
+  end
+
   class TopStruct < Test::Unit::TestCase
     include TestStruct