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-rw-r--r--include/ruby/io/buffer.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/ruby/io/buffer.h b/include/ruby/io/buffer.h
index 073215186c..053e7e17f9 100644
--- a/include/ruby/io/buffer.h
+++ b/include/ruby/io/buffer.h
@@ -16,6 +16,9 @@
RUBY_SYMBOL_EXPORT_BEGIN
+// WARNING: This entire interface is experimental and may change in the future!
+#define RB_IO_BUFFER_EXPERIMENTAL 1
+
RUBY_EXTERN VALUE rb_cIOBuffer;
RUBY_EXTERN size_t RUBY_IO_BUFFER_PAGE_SIZE;