From fb6fa9697907e387b1408320a070c263ad19201b Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Mon, 23 Mar 2026 20:31:09 +0800
Subject: [PATCH] fixes #25626; Fix injection variable declaration in
 sequtils.nim (#25629)

fixes #25626

This pull request introduces a small change to the `mapIt` template in
`sequtils.nim`. The update adds the `used` pragma to the injected `it`
variable, which can help suppress unused variable warnings in certain
cases.

- Added the `used` pragma to the injected `it` variable in the `mapIt`
template to prevent unused variable warnings.

or it should give a better warning or something if `it` is not used
---
 lib/pure/collections/sequtils.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/pure/collections/sequtils.nim b/lib/pure/collections/sequtils.nim
index 3dba087aa8..299349a05a 100644
--- a/lib/pure/collections/sequtils.nim
+++ b/lib/pure/collections/sequtils.nim
@@ -1092,7 +1092,7 @@ template mapIt*(s: typed, op: untyped): untyped =
 
   type OutType = typeof((
     block:
-      var it{.inject.}: typeof(items(s), typeOfIter);
+      var it{.inject, used.}: typeof(items(s), typeOfIter);
       op), typeOfProc)
   when OutType is not (proc):
     # Here, we avoid to create closures in loops.