From fad19f574ba5ed80fbbaf2fd1b575336089af167 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Thu, 7 May 2026 20:23:33 +0300
Subject: [PATCH] checker: default expr fix

---
 vlib/v/checker/struct.v                       |  3 ++-
 .../struct_ref_field_nil_const_default_test.v | 21 +++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 vlib/v/tests/structs/struct_ref_field_nil_const_default_test.v

diff --git a/vlib/v/checker/struct.v b/vlib/v/checker/struct.v
index 3120f4ad9..2d8230002 100644
--- a/vlib/v/checker/struct.v
+++ b/vlib/v/checker/struct.v
@@ -164,7 +164,8 @@ fn (mut c Checker) struct_decl(mut node ast.StructDecl) {
 			if field.has_default_expr {
 				c.expected_type = field.typ
 				field.default_expr_typ = c.expr(mut field.default_expr)
-				if field.typ.is_ptr() != field.default_expr_typ.is_ptr() {
+				if field.typ.is_ptr() != field.default_expr_typ.is_ptr()
+					&& field.default_expr_typ.idx() !in ast.pointer_type_idxs {
 					default_pos := field.default_expr.pos()
 					if field.default_expr is ast.CallExpr {
 						err_desc := if field.typ.is_ptr() { 'is' } else { 'is not' }
diff --git a/vlib/v/tests/structs/struct_ref_field_nil_const_default_test.v b/vlib/v/tests/structs/struct_ref_field_nil_const_default_test.v
new file mode 100644
index 000000000..e4f6590ec
--- /dev/null
+++ b/vlib/v/tests/structs/struct_ref_field_nil_const_default_test.v
@@ -0,0 +1,21 @@
+const null_ptr = unsafe { nil }
+
+struct RefDefaultWindow {
+	w int
+}
+
+struct RefDefaultCtx {
+mut:
+	window &RefDefaultWindow = null_ptr
+	voidp  voidptr           = null_ptr
+	bytep  &u8               = null_ptr
+	charp  &char             = null_ptr
+}
+
+fn test_ref_field_with_nil_const_default() {
+	c := RefDefaultCtx{}
+	assert c.window == unsafe { nil }
+	assert c.voidp == unsafe { nil }
+	assert c.bytep == unsafe { nil }
+	assert c.charp == unsafe { nil }
+}
-- 
2.39.5