compiler: optionals default value

vlib/compiler/tests/defer_test.v

@@ -46,6 +46,8 @@ fn test_defer_early_exit() {
 
 fn test_defer_option() {
 	mut ok := Num{0}
-	set_num_opt(mut ok)
+	set_num_opt(mut ok) or {
+		assert false
+	}
 	assert ok.val == 1
 }

vlib/compiler/tests/option_test.v

@@ -58,3 +58,15 @@ fn test_if_opt() {
 	assert 1 == 1
 	println('nice')
 }
+
+fn for_opt_default() ?string {
+        return error('awww')
+}
+
+fn test_opt_default() {
+	a := for_opt_default() or {
+			// panic(err)
+			'default'
+	}
+	assert a == 'default'
+}