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-rw-r--r--class.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/class.c b/class.c
index fc99ce4..d73724b 100644
--- a/class.c
+++ b/class.c
@@ -854,6 +854,9 @@ ensure_includable(VALUE klass, VALUE module)
{
rb_frozen_class_p(klass);
Check_Type(module, T_MODULE);
+ if (!NIL_P(rb_refinement_module_get_refined_class(module))) {
+ rb_raise(rb_eArgError, "refinement module is not allowed");
+ }
OBJ_INFECT(klass, module);
}