From 07465a4e7dc72e5416b5c3583fe3bb8ea0c4fe33 Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Tue, 24 Sep 2024 00:54:02 -0300
Subject: [PATCH] checker: fix fntype var marked as auto heap (#22290)

---
 vlib/v/checker/checker.v                  |  7 +++++++
 vlib/v/tests/pointers/ref_callback_test.v | 20 ++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 vlib/v/tests/pointers/ref_callback_test.v

diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 2f0b155b92..40bfc7a099 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -4376,6 +4376,13 @@ fn (mut c Checker) mark_as_referenced(mut node ast.Expr, as_interface bool) {
 							}
 						}
 						.sum_type, .interface_ {}
+						.function {
+							if type_sym.info is ast.FnType {
+								if type_sym.info.is_anon {
+									node.obj.is_auto_heap = true
+								}
+							}
+						}
 						else {
 							node.obj.is_auto_heap = true
 						}
diff --git a/vlib/v/tests/pointers/ref_callback_test.v b/vlib/v/tests/pointers/ref_callback_test.v
new file mode 100644
index 0000000000..6035f5740c
--- /dev/null
+++ b/vlib/v/tests/pointers/ref_callback_test.v
@@ -0,0 +1,20 @@
+module main
+
+struct Struct_voidptr {
+	func voidptr
+}
+
+fn function() string {
+	return 'Function!'
+}
+
+fn test_main() {
+	fun := function
+
+	sct := Struct_voidptr{
+		func: &fun
+	}
+
+	assert fun() == 'Function!'
+	assert sct.func == &fun
+}