rust-clippy/tests/compile-fail/no_effect.rs

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#![feature(plugin, box_syntax, inclusive_range_syntax)]
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#![plugin(clippy)]
#![deny(no_effect, unnecessary_operation)]
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#![allow(dead_code)]
#![allow(path_statements)]
struct Unit;
struct Tuple(i32);
struct Struct {
field: i32
}
enum Enum {
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Tuple(i32),
Struct { field: i32 },
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}
fn get_number() -> i32 { 0 }
fn get_struct() -> Struct { Struct { field: 0 } }
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unsafe fn unsafe_fn() -> i32 { 0 }
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fn main() {
let s = get_struct();
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let s2 = get_struct();
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0; //~ERROR statement with no effect
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s2; //~ERROR statement with no effect
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Unit; //~ERROR statement with no effect
Tuple(0); //~ERROR statement with no effect
Struct { field: 0 }; //~ERROR statement with no effect
Struct { ..s }; //~ERROR statement with no effect
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Enum::Tuple(0); //~ERROR statement with no effect
Enum::Struct { field: 0 }; //~ERROR statement with no effect
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5 + 6; //~ERROR statement with no effect
*&42; //~ERROR statement with no effect
&6; //~ERROR statement with no effect
(5, 6, 7); //~ERROR statement with no effect
box 42; //~ERROR statement with no effect
..; //~ERROR statement with no effect
5..; //~ERROR statement with no effect
..5; //~ERROR statement with no effect
5..6; //~ERROR statement with no effect
5...6; //~ERROR statement with no effect
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[42, 55]; //~ERROR statement with no effect
[42, 55][1]; //~ERROR statement with no effect
(42, 55).1; //~ERROR statement with no effect
[42; 55]; //~ERROR statement with no effect
[42; 55][13]; //~ERROR statement with no effect
let mut x = 0;
|| x += 5; //~ERROR statement with no effect
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// Do not warn
get_number();
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unsafe { unsafe_fn() };
Tuple(get_number()); //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
Struct { field: get_number() }; //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
Struct { ..get_struct() }; //~ERROR statement can be reduced
//~^HELP replace it with
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//~|SUGGESTION get_struct();
Enum::Tuple(get_number()); //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
Enum::Struct { field: get_number() }; //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
5 + get_number(); //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION 5;get_number();
*&get_number(); //~ERROR statement can be reduced
//~^HELP replace it with
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//~|SUGGESTION get_number();
&get_number(); //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
(5, 6, get_number()); //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION 5;6;get_number();
box get_number(); //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
get_number()..; //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
..get_number(); //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
5..get_number(); //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION 5;get_number();
[42, get_number()]; //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION 42;get_number();
[42, 55][get_number() as usize]; //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION [42, 55];get_number() as usize;
(42, get_number()).1; //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION 42;get_number();
[get_number(); 55]; //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
[42; 55][get_number() as usize]; //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION [42; 55];get_number() as usize;
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{get_number()}; //~ERROR statement can be reduced
//~^HELP replace it with
//~|SUGGESTION get_number();
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}