avoid null references on illegal input

diff --git a/lang/pc/comp/main.c b/lang/pc/comp/main.c
index 1833b6f..a6caf95 100644 (file)
--- a/lang/pc/comp/main.c
+++ b/lang/pc/comp/main.c
@@ -223,8 +223,8 @@ AddRequired()
                (void) Enter("string", D_TYPE, string_type, 0);
 
        /* DIRECTIVES */
-       (void) Enter("forward", D_FORWARD, NULLTYPE, 0);
-       (void) Enter("extern", D_EXTERN, NULLTYPE, 0);
+       (void) Enter("forward", D_FORWARD, error_type, 0);
+       (void) Enter("extern", D_EXTERN, error_type, 0);
 
        /* CONSTANTS */
        /* nil is TOKEN and thus part of the grammar */