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-rw-r--r--include/ruby/io.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/ruby/io.h b/include/ruby/io.h
index cc3f5e60b1..f71176043f 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -188,8 +188,8 @@ int rb_io_extract_encoding_option(VALUE opt, rb_encoding **enc_p, rb_encoding **
ssize_t rb_io_bufwrite(VALUE io, const void *buf, size_t size);
/* compatibility for ruby 1.8 and older */
-#define rb_io_mode_flags(modestr) rb_io_modestr_fmode(modestr)
-#define rb_io_modenum_flags(oflags) rb_io_oflags_fmode(oflags)
+#define rb_io_mode_flags(modestr) [<"rb_io_mode_flags() is obsolete; use rb_io_modestr_fmode()">]
+#define rb_io_modenum_flags(oflags) [<"rb_io_modenum_flags() is obsolete; use rb_io_oflags_fmode()">]
VALUE rb_io_taint_check(VALUE);
NORETURN(void rb_eof_error(void));