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-rw-r--r--include/ruby/io.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/io.h b/include/ruby/io.h
index 45384db586..2ccaf0f1f9 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -164,7 +164,7 @@ NORETURN(void rb_eof_error(void));
void rb_io_read_check(rb_io_t*);
int rb_io_read_pending(rb_io_t*);
-void rb_read_check(FILE*);
+DEPRECATED(void rb_read_check(FILE*));
#if defined(__cplusplus)
#if 0