Kernel#loop returns the result value of a finished iterator

* vm_eval.c (rb_f_loop): When a loop is stopped by a StopIteration
  exception, return what the enumerator has returned instead of
  nil. [ruby-core:71133] [Feature #11498]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52218 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/ruby/test_enumerator.rb b/test/ruby/test_enumerator.rb
index 91c91a4bbd..e81d2e4e72 100644
--- a/test/ruby/test_enumerator.rb
+++ b/test/ruby/test_enumerator.rb
@@ -46,6 +46,14 @@ class TestEnumerator < Test::Unit::TestCase
     }
   end
 
+  def test_loop_return_value
+    assert_equal nil, loop { break }
+    assert_equal 42,  loop { break 42 }
+
+    e = Enumerator.new { |y| y << 1; y << 2; :stopped }
+    assert_equal :stopped, loop { e.next while true }
+  end
+
   def test_nested_iteration
     def (o = Object.new).each
       yield :ok1