rust-clippy/tests/ui/redundant_pattern_matching.rs

// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![warn(clippy::all)]
#![warn(clippy::redundant_pattern_matching)]

fn main() {
    if let Ok(_) = Ok::<i32, i32>(42) {}

    if let Err(_) = Err::<i32, i32>(42) {}

    if let None = None::<()> {}

    if let Some(_) = Some(42) {}

    if Ok::<i32, i32>(42).is_ok() {}

    if Err::<i32, i32>(42).is_err() {}

    if None::<i32>.is_none() {}

    if Some(42).is_some() {}

    if let Ok(x) = Ok::<i32, i32>(42) {
        println!("{}", x);
    }

    match Ok::<i32, i32>(42) {
        Ok(_) => true,
        Err(_) => false,
    };

    match Ok::<i32, i32>(42) {
        Ok(_) => false,
        Err(_) => true,
    };

    match Err::<i32, i32>(42) {
        Ok(_) => false,
        Err(_) => true,
    };

    match Err::<i32, i32>(42) {
        Ok(_) => true,
        Err(_) => false,
    };

    match Some(42) {
        Some(_) => true,
        None => false,
    };

    match None::<()> {
        Some(_) => false,
        None => true,
    };
}