From 214628a939d744768e5bba9b49699ea81a8d3f83 Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Fri, 29 Aug 2025 09:32:57 -0300
Subject: [PATCH] markused: fix option map value (fix #25186) (#25188)

---
 vlib/v/markused/walker.v                   | 3 +++
 vlib/v/tests/options/option_map_val_test.v | 6 ++++++
 2 files changed, 9 insertions(+)
 create mode 100644 vlib/v/tests/options/option_map_val_test.v

diff --git a/vlib/v/markused/walker.v b/vlib/v/markused/walker.v
index 5b30333789..a7a286a72b 100644
--- a/vlib/v/markused/walker.v
+++ b/vlib/v/markused/walker.v
@@ -1183,6 +1183,9 @@ pub fn (mut w Walker) mark_by_sym(isym ast.TypeSymbol) {
 			w.mark_by_type(isym.info.key_type)
 			w.mark_by_type(isym.info.value_type)
 			w.features.used_maps++
+			if isym.info.value_type.has_flag(.option) {
+				w.used_option++
+			}
 		}
 		ast.Alias {
 			w.mark_by_type(isym.info.parent_type)
diff --git a/vlib/v/tests/options/option_map_val_test.v b/vlib/v/tests/options/option_map_val_test.v
new file mode 100644
index 0000000000..fb045bba90
--- /dev/null
+++ b/vlib/v/tests/options/option_map_val_test.v
@@ -0,0 +1,6 @@
+fn test_main() {
+	mut m := map[int]?u32{}
+	if c := m[0] {
+		println('c:  ${c} not none!')
+	}
+}