From af3ddf6ac4966816547c24f3fed31f1f22858d32 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Wed, 15 Apr 2026 15:21:40 +0300
Subject: [PATCH] cgen: fix c compiler error when using
 datatypes.LinkedList[&SomeType] (fixes #25214)

---
 .../generic_linked_list_ref_push_test.v       | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 vlib/v/tests/generics/generic_linked_list_ref_push_test.v

diff --git a/vlib/v/tests/generics/generic_linked_list_ref_push_test.v b/vlib/v/tests/generics/generic_linked_list_ref_push_test.v
new file mode 100644
index 000000000..5fd5ee192
--- /dev/null
+++ b/vlib/v/tests/generics/generic_linked_list_ref_push_test.v
@@ -0,0 +1,90 @@
+import datatypes
+
+interface PoolView {
+	uid       u64
+	view_type PoolViewType
+mut:
+	content []PoolView
+}
+
+enum PoolViewType {
+	container
+	text
+}
+
+struct PoolSpan {
+	text string
+}
+
+struct PoolContainerView implements PoolView {
+	uid       u64
+	view_type PoolViewType = .container
+mut:
+	content []PoolView
+}
+
+struct PoolTextView implements PoolView {
+	uid       u64
+	view_type PoolViewType = .text
+mut:
+	content []PoolView
+}
+
+fn (mut cv PoolContainerView) reset_fields() {
+	cv.content = []PoolView{}
+}
+
+fn (mut tv PoolTextView) reset_fields() {
+	tv.content = []PoolView{}
+}
+
+struct PoolViewPool {
+mut:
+	spans      datatypes.LinkedList[PoolSpan]           = datatypes.LinkedList[PoolSpan]{}
+	containers datatypes.LinkedList[&PoolContainerView] = datatypes.LinkedList[&PoolContainerView]{}
+	texts      datatypes.LinkedList[&PoolTextView]      = datatypes.LinkedList[&PoolTextView]{}
+	in_use     map[u64]bool
+}
+
+fn (mut vp PoolViewPool) seed_spans() {
+	vp.spans.push(PoolSpan{'span'})
+}
+
+fn (mut vp PoolViewPool) reclaim_container_view(mut cv PoolContainerView) {
+	if cv.uid !in vp.in_use {
+		return
+	}
+	cv.reset_fields()
+	vp.in_use.delete(cv.uid)
+	vp.containers.push(cv)
+}
+
+fn (mut vp PoolViewPool) reclaim_text_view(mut tv PoolTextView) {
+	if tv.uid !in vp.in_use {
+		return
+	}
+	tv.reset_fields()
+	vp.in_use.delete(tv.uid)
+	vp.texts.push(tv)
+}
+
+fn test_generic_linked_list_ref_push_with_mut_params() {
+	mut vp := PoolViewPool{}
+	vp.seed_spans()
+
+	mut cv := PoolContainerView{
+		uid: 1
+	}
+	vp.in_use[cv.uid] = true
+	vp.reclaim_container_view(mut cv)
+
+	mut tv := PoolTextView{
+		uid: 2
+	}
+	vp.in_use[tv.uid] = true
+	vp.reclaim_text_view(mut tv)
+
+	assert vp.spans.len() == 1
+	assert vp.containers.len() == 1
+	assert vp.texts.len() == 1
+}
-- 
2.39.5