1 // Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution.
4 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
5 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
7 // option. This file may not be copied, modified, or distributed
8 // except according to those terms.
10 fn some_func(a: Option<u32>) -> Option<u32> {
18 pub enum SeemsOption<T> {
23 impl<T> SeemsOption<T> {
24 pub fn is_none(&self) -> bool {
26 SeemsOption::None => true,
27 SeemsOption::Some(_) => false,
32 fn returns_something_similar_to_option(a: SeemsOption<u32>) -> SeemsOption<u32> {
34 return SeemsOption::None;
40 pub struct SomeStruct {
45 pub fn func(&self) -> Option<u32> {
46 if (self.opt).is_none() {
58 let some_struct = SomeStruct { opt: Some(54) };
61 let so = SeemsOption::Some(45);
62 returns_something_similar_to_option(so);