55 lines
1.2 KiB
Rust
55 lines
1.2 KiB
Rust
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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enum Wrapper {
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Wrap(i32),
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}
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use Wrapper::Wrap;
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pub fn main() {
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let Wrap(x) = &Wrap(3);
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println!("{}", *x);
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let Wrap(x) = &mut Wrap(3);
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println!("{}", *x);
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if let Some(x) = &Some(3) {
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println!("{}", *x);
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} else {
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panic!();
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}
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if let Some(x) = &mut Some(3) {
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println!("{}", *x);
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} else {
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panic!();
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}
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if let Some(x) = &mut Some(3) {
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*x += 1;
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} else {
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panic!();
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}
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while let Some(x) = &Some(3) {
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println!("{}", *x);
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break;
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}
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while let Some(x) = &mut Some(3) {
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println!("{}", *x);
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break;
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}
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while let Some(x) = &mut Some(3) {
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*x += 1;
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break;
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}
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}
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