1 files changed, 1 insertions, 0 deletions

diff --git a/lisp_api.h b/lisp_api.h
index 90e05e1..9527551 100644
--- a/lisp_api.h
+++ b/lisp_api.h
@@ -48,6 +48,7 @@ struct value {
 			env *env;
 		} thunk;
 	} as;
+	int reachable;
 };
 
 value *make_int(int i);