1 files changed, 7 insertions, 1 deletions
diff --git a/awk.h b/awk.h
index d413274c..0a34c258 100644
--- a/awk.h
+++ b/awk.h
@@ -1762,9 +1762,15 @@ extern uintmax_t adjust_uint(uintmax_t n);
 /* POP_ARRAY --- get the array at the top of the stack */
 
 static inline NODE *
-POP_ARRAY()
+POP_ARRAY(bool check_for_untyped)
 {
 	NODE *t = POP();
+	static bool warned = false;
+
+	if (do_lint && ! warned && check_for_untyped && t->type == Node_var_new) {
+		warned = true;
+		lintwarn(_("behavior of `for' loop on untyped variable is not defined by POSIX"));
+	}
 
 	return (t->type == Node_var_array) ? t : force_array(t, true);
 }