From d66a29db7ca4372dba116928f979e92cb7f7661f Mon Sep 17 00:00:00 2001
From: Etan Kissling <etan@status.im>
Date: Wed, 28 Feb 2024 23:03:04 +0100
Subject: [PATCH] avoid `XDeclaredButNotUsed` in `kvstore_sqlite3` with empty
 tuple (#680)

Suppresses an annoying hint that gets triggered when `params is tuple`
but it's an empty tuple without fields.

```
Hint: 'i' is declared but not used [XDeclaredButNotUsed]
```
---
 eth/db/kvstore_sqlite3.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/eth/db/kvstore_sqlite3.nim b/eth/db/kvstore_sqlite3.nim
index b251b89..dce35da 100644
--- a/eth/db/kvstore_sqlite3.nim
+++ b/eth/db/kvstore_sqlite3.nim
@@ -248,7 +248,7 @@ iterator exec*[Params, Res](s: SqliteStmt[Params, Res],
   # `yield` statements cause when inlining the loop body
   var res = KvResult[void].ok()
   when params is tuple:
-    var i = 1
+    var i {.used.} = 1
     for param in fields(params):
       if (let v = bindParam(s, i, param); v != SQLITE_OK):
         res = KvResult[void].err(toErrorString(s.env, v))