94 lines
1.9 KiB
Rust
94 lines
1.9 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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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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#![warn(clippy::single_match)]
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fn dummy() {}
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fn single_match() {
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let x = Some(1u8);
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match x {
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Some(y) => {
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println!("{:?}", y);
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},
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_ => (),
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};
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let x = Some(1u8);
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match x {
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// Note the missing block braces.
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// We suggest `if let Some(y) = x { .. }` because the macro
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// is expanded before we can do anything.
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Some(y) => println!("{:?}", y),
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_ => (),
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}
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let z = (1u8, 1u8);
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match z {
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(2...3, 7...9) => dummy(),
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_ => {},
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};
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// Not linted (pattern guards used)
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match x {
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Some(y) if y == 0 => println!("{:?}", y),
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_ => (),
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}
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// Not linted (no block with statements in the single arm)
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match z {
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(2...3, 7...9) => println!("{:?}", z),
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_ => println!("nope"),
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}
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}
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enum Foo {
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Bar,
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Baz(u8),
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}
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use std::borrow::Cow;
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use Foo::*;
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fn single_match_know_enum() {
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let x = Some(1u8);
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let y: Result<_, i8> = Ok(1i8);
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match x {
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Some(y) => dummy(),
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None => (),
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};
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match y {
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Ok(y) => dummy(),
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Err(..) => (),
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};
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let c = Cow::Borrowed("");
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match c {
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Cow::Borrowed(..) => dummy(),
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Cow::Owned(..) => (),
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};
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let z = Foo::Bar;
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// no warning
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match z {
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Bar => println!("42"),
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Baz(_) => (),
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}
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match z {
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Baz(_) => println!("42"),
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Bar => (),
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}
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}
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fn main() {}
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