Module#ancestors should not return superclasses of refinements

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

Reported by Eregon (Benoit Daloze).  Thanks!

1 files changed, 5 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);