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-rw-r--r--regparse.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/regparse.h b/regparse.h
index 111a840..888ebf4 100644
--- a/regparse.h
+++ b/regparse.h
@@ -95,6 +95,7 @@ RUBY_SYMBOL_EXPORT_BEGIN
#define ENCLOSE_OPTION (1<<1)
#define ENCLOSE_STOP_BACKTRACK (1<<2)
#define ENCLOSE_CONDITION (1<<3)
+#define ENCLOSE_ABSENT (1<<4)
#define NODE_STR_MARGIN 16
#define NODE_STR_BUF_SIZE 24 /* sizeof(CClassNode) - sizeof(int)*4 */