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-rw-r--r--include/ruby/backward/2/r_cast.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/ruby/backward/2/r_cast.h b/include/ruby/backward/2/r_cast.h
index d3f728eb5c..4600699a9e 100644
--- a/include/ruby/backward/2/r_cast.h
+++ b/include/ruby/backward/2/r_cast.h
@@ -24,4 +24,10 @@
*/
#define R_CAST(st) (struct st*)
#define RMOVED(obj) (R_CAST(RMoved)(obj))
+
+#if defined(__GNUC__)
+# warning R_CAST and RMOVED are deprecated
+#elif defined(_MSC_VER)
+# pragma message("warning: R_CAST and RMOVED are deprecated")
+#endif
#endif /* RUBY_BACKWARD2_R_CAST_H */