Module#ancestors should not return superclasses of refinements

[ruby-core:86949] [Bug #14744]

Reported by Eregon (Benoit Daloze).  Thanks!

2 files changed, 17 insertions, 0 deletions

diff --git a/class.c b/class.c
index 41dbcf5150..9e5cf5416f 100644
--- a/class.c
+++ b/class.c
@@ -1347,8 +1347,13 @@ VALUE
 rb_mod_ancestors(VALUE mod)
 {
     VALUE p, ary = rb_ary_new();
+    VALUE refined_class = Qnil;
+    if (FL_TEST(mod, RMODULE_IS_REFINEMENT)) {
+        refined_class = rb_refinement_module_get_refined_class(mod);
+    }
 
     for (p = mod; p; p = RCLASS_SUPER(p)) {
+        if (p == refined_class) break;
         if (p != RCLASS_ORIGIN(p)) continue;
 	if (BUILTIN_TYPE(p) == T_ICLASS) {
 	    rb_ary_push(ary, RBASIC(p)->klass);
diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index 14c112f344..822de47f6a 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -2559,6 +2559,18 @@ class TestRefinement < Test::Unit::TestCase
     assert_equal(:refined, Bug17822::Client.call_foo)
   end
 
+  def test_ancestors
+    refinement = nil
+    as = nil
+    Module.new do
+      refine Array do
+        refinement = self
+        as = ancestors
+      end
+    end
+    assert_equal([refinement], as, "[ruby-core:86949] [Bug #14744]")
+  end
+
   private
 
   def eval_using(mod, s)