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-rw-r--r--include/ruby/encoding.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/encoding.h b/include/ruby/encoding.h
index ae1ec13e74..ecc00aff5e 100644
--- a/include/ruby/encoding.h
+++ b/include/ruby/encoding.h
@@ -255,6 +255,7 @@ void rb_econv_binmode(rb_econv_t *ec);
#define ECONV_UNDEF_MASK 0x00f0
#define ECONV_UNDEF_REPLACE 0x0020
+#define ECONV_UNDEF_HEX_CHARREF 0x0030
/* effective only if output is ascii compatible */
#define ECONV_UNIVERSAL_NEWLINE_DECODER 0x0100