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-rw-r--r--include/ruby/internal/module.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/ruby/internal/module.h b/include/ruby/internal/module.h
index 0f2dfdb1be..1dc6b820cc 100644
--- a/include/ruby/internal/module.h
+++ b/include/ruby/internal/module.h
@@ -25,6 +25,10 @@
RBIMPL_SYMBOL_EXPORT_BEGIN()
+/**
+ * GC compaction note: class and modules returned by these four functions
+ * do not move.
+ */
VALUE rb_define_class(const char*,VALUE);
VALUE rb_define_module(const char*);
VALUE rb_define_class_under(VALUE, const char*, VALUE);