cgen: fix aliased fixed array option fn call (fix #22927)

vlib/v/gen/c/cgen.v

@@ -5790,7 +5790,7 @@ fn (mut g Gen) return_stmt(node ast.Return) {
 				node.pos)
 		}
 		// normal return
-		return_sym := g.table.sym(g.unwrap_generic(node.types[0]))
+		return_sym := g.table.final_sym(g.unwrap_generic(node.types[0]))
 		expr0 := node.exprs[0]
 		// `return opt_ok(expr)` for functions that expect an option
 		expr_type_is_opt := match expr0 {
@@ -7229,8 +7229,7 @@ fn (mut g Gen) gen_or_block_stmts(cvar_name string, cast_typ string, stmts []ast
 					mut is_array_fixed := false
 					mut return_wrapped := false
 					if is_option {
-						is_array_fixed = expr_stmt.expr in [ast.ArrayInit, ast.CastExpr]
-							&& g.table.final_sym(return_type).kind == .array_fixed
+						is_array_fixed = g.table.final_sym(return_type).kind == .array_fixed
 						if !is_array_fixed {
 							if g.inside_return && !g.inside_struct_init
 								&& expr_stmt.expr is ast.CallExpr&& (expr_stmt.expr as ast.CallExpr).return_type.has_option_or_result()

vlib/v/tests/aliases/aliased_fixed_array_option_fn_call_test.v

@@ -0,0 +1,43 @@
+import encoding.binary
+
+pub type Addr = [4]u8
+
+pub fn Addr.from_u32(a u32) Addr {
+	mut bytes := [4]u8{}
+	binary.big_endian_put_u32_fixed(mut bytes, a)
+	return Addr(bytes)
+}
+
+pub fn (a Addr) u32() u32 {
+	return binary.big_endian_u32_fixed(a)
+}
+
+struct Net {
+	netaddr   Addr
+	broadcast Addr
+}
+
+// returns Nth IP-address from the network if exists, else none
+fn (n Net) nth(num i64) ?Addr {
+	mut addr := Addr{}
+	if num >= 0 {
+		addr = Addr.from_u32(n.netaddr.u32() + u32(num))
+	} else {
+		addr = Addr.from_u32(n.broadcast.u32() + u32(num))
+	}
+	if !(n.netaddr.u32() < addr.u32() && addr.u32() < n.broadcast.u32()) {
+		return none
+	}
+	return addr
+}
+
+fn test_aliased_fixed_array_option_fn_call() {
+	net := Net{
+		netaddr:   Addr([u8(172), 16, 16, 0]!)
+		broadcast: Addr([u8(172), 16, 16, 3]!)
+	}
+	res1 := net.nth(1) or { panic(err) }
+	res2 := net.nth(1) or { Addr{} }
+	assert res1 == [u8(172), 16, 16, 1]!
+	assert res2 == [u8(172), 16, 16, 1]!
+}