rust-clippy/tests/ui/unnecessary_operation.rs

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// 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.
#![feature(box_syntax)]
#![allow(clippy::deref_addrof)]
#![warn(clippy::unnecessary_operation)]
struct Tuple(i32);
struct Struct {
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field: i32,
}
enum Enum {
Tuple(i32),
Struct { field: i32 },
}
struct DropStruct {
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field: i32,
}
impl Drop for DropStruct {
fn drop(&mut self) {}
}
struct DropTuple(i32);
impl Drop for DropTuple {
fn drop(&mut self) {}
}
enum DropEnum {
Tuple(i32),
Struct { field: i32 },
}
impl Drop for DropEnum {
fn drop(&mut self) {}
}
struct FooString {
s: String,
}
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fn get_number() -> i32 {
0
}
fn get_struct() -> Struct {
Struct { field: 0 }
}
fn get_drop_struct() -> DropStruct {
DropStruct { field: 0 }
}
fn main() {
Tuple(get_number());
Struct { field: get_number() };
Struct { ..get_struct() };
Enum::Tuple(get_number());
Enum::Struct { field: get_number() };
5 + get_number();
*&get_number();
&get_number();
(5, 6, get_number());
box get_number();
get_number()..;
..get_number();
5..get_number();
[42, get_number()];
[42, 55][get_number() as usize];
(42, get_number()).1;
[get_number(); 55];
[42; 55][get_number() as usize];
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{
get_number()
};
FooString {
s: String::from("blah"),
};
// Do not warn
DropTuple(get_number());
DropStruct { field: get_number() };
DropStruct { field: get_number() };
DropStruct { ..get_drop_struct() };
DropEnum::Tuple(get_number());
DropEnum::Struct { field: get_number() };
}