Prepare for error guards

1 files changed, 1 insertions, 0 deletions

diff --git a/apl9.h b/apl9.h
index d8afcb1..d115ea3 100644
--- a/apl9.h
+++ b/apl9.h
@@ -120,6 +120,7 @@ struct Array
 struct Statement
 {
 	int ntoks;
+	int errorguard; /* if guard != nil, is the guard an error guard? */
 	Datum **toks;
 	Statement *guard;
 	Statement *next;