From 537d99439dc77530d717b23806447b178d63901a Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Wed, 15 Apr 2026 02:57:44 +0300
Subject: [PATCH] checker: fix cannot use `[]Data` as `[]Cols` even though
 `Data` implements `Cols` (fixes #23666)

---
 ...interface_array_implicit_conversion_test.v | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/vlib/v/tests/interfaces/interface_array_implicit_conversion_test.v b/vlib/v/tests/interfaces/interface_array_implicit_conversion_test.v
index b901b3bb8..6c57a679a 100644
--- a/vlib/v/tests/interfaces/interface_array_implicit_conversion_test.v
+++ b/vlib/v/tests/interfaces/interface_array_implicit_conversion_test.v
@@ -41,3 +41,27 @@ fn test_append_array_of_structs_to_array_of_interface() {
 	points << spoints
 	assert sum_x(points) == 26
 }
+
+interface Cols {
+	cols() string
+}
+
+struct Data implements Cols {}
+
+fn (d Data) cols() string {
+	return 'data'
+}
+
+fn print_first_last(cols []Cols) string {
+	return '${cols[0].cols()}:${cols[cols.len - 1].cols()}'
+}
+
+fn test_pass_len_initialized_array_of_implements_struct_to_array_of_interface_param() {
+	data := []Data{len: 3}
+	assert print_first_last(data) == 'data:data'
+}
+
+fn test_pass_array_of_struct_pointers_to_array_of_interface_param() {
+	data := []&Data{len: 3, init: &Data{}}
+	assert print_first_last(data) == 'data:data'
+}
-- 
2.39.5