seitan: add op_end

The op_end signal to terminate reading the operations. This is useful
for the introductions of branches for the matches.

1 files changed, 1 insertions, 0 deletions

diff --git a/gluten.h b/gluten.h
index 699d682..69a6b6b 100644
--- a/gluten.h
+++ b/gluten.h
@@ -51,6 +51,7 @@ enum op_type {
 	OP_INJECT_A,
 	OP_RETURN,
 	OP_COPY_ARGS,
+	OP_END,
 };
 
 enum value_type {