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-rw-r--r--include/ruby/ruby.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index f25c67aaef..aa0861e92c 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -737,6 +737,7 @@ struct RClass {
#define RMODULE_SUPER(m) RCLASS_SUPER(m)
#define RMODULE_IS_OVERLAID FL_USER2
#define RMODULE_IS_REFINEMENT FL_USER3
+#define RMODULE_INCLUDED_INTO_REFINEMENT FL_USER4
struct RFloat {
struct RBasic basic;