src: introduce simple hints on incorrect identifier

 # cat test.nft
 define test = "1.2.3.4"

 table ip x {
        chain y {
                ip saddr $text
        }
 }
 # nft -f test.nft
 test.nft:5:13-16: Error: unknown identifier 'text'; did you mean identifier ‘test’?
                 ip saddr $text
                           ^^^^

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/rule.h b/include/rule.h
index 88fed62e..dc5e5b87 100644
--- a/include/rule.h
+++ b/include/rule.h
@@ -112,6 +112,8 @@ extern void symbol_bind(struct scope *scope, const char *identifier,
 extern int symbol_unbind(const struct scope *scope, const char *identifier);
 extern struct symbol *symbol_lookup(const struct scope *scope,
 				    const char *identifier);
+struct symbol *symbol_lookup_fuzzy(const struct scope *scope,
+				   const char *identifier);
 struct symbol *symbol_get(const struct scope *scope, const char *identifier);
 
 enum table_flags {