added comment

diff --git a/util/cpp/input.c b/util/cpp/input.c
index 135b45d..6734b68 100644 (file)
--- a/util/cpp/input.c
+++ b/util/cpp/input.c
@@ -42,6 +42,9 @@ int   InputLevel;
 AtEoIT()
 {
        /* if (NoUnstack) warning("unexpected EOF"); ??? */
+       /* This is wrong; in an #elif, NoUnstack can be set, but you
+          can still get calls to AtEoIT().
+       */
        InputLevel--;
        DoUnstack();
        return 0;