From d41b06238dc2167f8e470aa2fb31cb937ff8fb3e Mon Sep 17 00:00:00 2001
From: Maria Matejka <mq@ucw.cz>
Date: Wed, 4 Oct 2023 19:57:55 +0200
Subject: Filter: explicitly forbidden for-loop with pre-defined variable

---
 filter/config.Y | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/filter/config.Y b/filter/config.Y
index cf25d874..3cd8e3e4 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -974,7 +974,7 @@ var:
 
 for_var:
    type symbol { $$ = cf_define_symbol(new_config, $2, SYM_VARIABLE | $1, offset, f_new_var(sym_->scope)); }
- | CF_SYM_KNOWN { $$ = $1; cf_assert_symbol($1, SYM_VARIABLE); }
+ | CF_SYM_KNOWN { cf_error("Use of a pre-defined variable in for loop is not allowed"); }
  ;
 
 cmd:
-- 
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