From b052af81c3969f173facffd5174177c4628ac187 Mon Sep 17 00:00:00 2001
From: CreeperFace <165158232+dy-tea@users.noreply.github.com>
Date: Thu, 27 Nov 2025 03:25:06 +0000
Subject: [PATCH] cgen: use variadic_count == 1 when passing variadic to call
 of same array type (fix #25827) (#25837)

---
 vlib/v/gen/c/fn.v                         | 2 +-
 vlib/v/tests/fns/variadic_fn_chain_test.v | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 vlib/v/tests/fns/variadic_fn_chain_test.v

diff --git a/vlib/v/gen/c/fn.v b/vlib/v/gen/c/fn.v
index 36962adb7..4af8d0a91 100644
--- a/vlib/v/gen/c/fn.v
+++ b/vlib/v/gen/c/fn.v
@@ -2612,7 +2612,7 @@ fn (mut g Gen) call_args(node ast.CallExpr) {
 					}
 				} else {
 					// passing variadic arg to another call which expects same array type
-					if args.len == 1
+					if variadic_count == 1
 						&& ((args[arg_nr].typ.has_flag(.variadic) && args[arg_nr].typ == varg_type)
 						|| (varg_type.has_flag(.variadic)
 						&& args[arg_nr].typ == varg_type.clear_flag(.variadic))) {
diff --git a/vlib/v/tests/fns/variadic_fn_chain_test.v b/vlib/v/tests/fns/variadic_fn_chain_test.v
new file mode 100644
index 000000000..a71c345eb
--- /dev/null
+++ b/vlib/v/tests/fns/variadic_fn_chain_test.v
@@ -0,0 +1,9 @@
+fn called(s string, l ...string) {}
+
+fn caller(s string, l ...string) {
+	called(s, l)
+}
+
+fn test_main() {
+	caller('')
+}
-- 
2.39.5