2023-02-27 13:07:44 +00:00
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#![feature(fn_traits, unboxed_closures)]
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2021-10-21 11:11:36 +00:00
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#![warn(clippy::no_effect_underscore_binding)]
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2022-10-06 07:44:38 +00:00
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#![allow(dead_code, path_statements)]
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2023-03-24 13:04:35 +00:00
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#![allow(
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clippy::deref_addrof,
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clippy::redundant_field_names,
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clippy::uninlined_format_args,
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2023-07-02 12:35:19 +00:00
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clippy::unnecessary_struct_initialization,
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clippy::useless_vec
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2023-03-24 13:04:35 +00:00
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)]
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2022-06-30 14:17:49 +00:00
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2023-12-16 13:12:50 +00:00
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use std::fmt::Display;
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use std::ops::{Neg, Shl};
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struct Cout;
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impl<T> Shl<T> for Cout
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where
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T: Display,
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{
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type Output = Self;
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fn shl(self, rhs: T) -> Self::Output {
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println!("{}", rhs);
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self
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}
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}
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impl Neg for Cout {
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type Output = Self;
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fn neg(self) -> Self::Output {
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println!("hello world");
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self
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}
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}
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2015-10-28 16:50:00 +00:00
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struct Unit;
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struct Tuple(i32);
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struct Struct {
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2018-12-09 22:26:16 +00:00
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field: i32,
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2015-10-28 16:50:00 +00:00
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}
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enum Enum {
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2016-02-01 11:51:33 +00:00
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Tuple(i32),
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Struct { field: i32 },
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2015-10-28 16:50:00 +00:00
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}
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2017-09-18 19:07:33 +00:00
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struct DropUnit;
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impl Drop for DropUnit {
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fn drop(&mut self) {}
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}
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struct DropStruct {
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2018-12-09 22:26:16 +00:00
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field: i32,
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2017-09-18 19:07:33 +00:00
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}
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impl Drop for DropStruct {
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fn drop(&mut self) {}
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}
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struct DropTuple(i32);
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impl Drop for DropTuple {
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fn drop(&mut self) {}
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}
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enum DropEnum {
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Tuple(i32),
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Struct { field: i32 },
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}
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impl Drop for DropEnum {
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fn drop(&mut self) {}
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}
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2017-10-07 22:32:09 +00:00
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struct FooString {
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s: String,
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}
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2016-08-28 17:43:55 +00:00
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union Union {
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a: u8,
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b: f64,
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}
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2018-12-09 22:26:16 +00:00
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fn get_number() -> i32 {
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0
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}
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fn get_struct() -> Struct {
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Struct { field: 0 }
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}
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fn get_drop_struct() -> DropStruct {
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DropStruct { field: 0 }
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}
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2015-10-28 16:50:00 +00:00
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2018-12-09 22:26:16 +00:00
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unsafe fn unsafe_fn() -> i32 {
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0
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}
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2016-05-25 16:51:35 +00:00
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2021-12-06 11:33:31 +00:00
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struct GreetStruct1;
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impl FnOnce<(&str,)> for GreetStruct1 {
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type Output = ();
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extern "rust-call" fn call_once(self, (who,): (&str,)) -> Self::Output {
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println!("hello {}", who);
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}
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}
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struct GreetStruct2();
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impl FnOnce<(&str,)> for GreetStruct2 {
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type Output = ();
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extern "rust-call" fn call_once(self, (who,): (&str,)) -> Self::Output {
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println!("hello {}", who);
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}
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}
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2022-04-07 17:39:59 +00:00
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struct GreetStruct3;
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2021-12-06 11:33:31 +00:00
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impl FnOnce<(&str,)> for GreetStruct3 {
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type Output = ();
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extern "rust-call" fn call_once(self, (who,): (&str,)) -> Self::Output {
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println!("hello {}", who);
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}
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}
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2015-10-28 16:50:00 +00:00
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fn main() {
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let s = get_struct();
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2016-02-11 12:50:41 +00:00
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let s2 = get_struct();
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2015-10-28 16:50:00 +00:00
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2017-02-08 13:58:07 +00:00
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0;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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//~| NOTE: `-D clippy::no-effect` implied by `-D warnings`
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2017-02-08 13:58:07 +00:00
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s2;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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Unit;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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Tuple(0);
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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Struct { field: 0 };
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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Struct { ..s };
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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Union { a: 0 };
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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Enum::Tuple(0);
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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Enum::Struct { field: 0 };
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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5 + 6;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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*&42;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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&6;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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(5, 6, 7);
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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..;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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5..;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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..5;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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5..6;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-09-28 17:40:19 +00:00
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5..=6;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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[42, 55];
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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[42, 55][1];
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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(42, 55).1;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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[42; 55];
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-02-08 13:58:07 +00:00
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[42; 55][13];
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2016-02-11 12:50:41 +00:00
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let mut x = 0;
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2017-02-08 13:58:07 +00:00
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|| x += 5;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2017-10-07 22:32:09 +00:00
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let s: String = "foo".into();
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FooString { s: s };
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: statement with no effect
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2021-10-21 11:11:36 +00:00
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let _unused = 1;
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: binding to `_` prefixed variable with no side-effect
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//~| NOTE: `-D clippy::no-effect-underscore-binding` implied by `-D warnings`
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2021-10-21 11:11:36 +00:00
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let _penguin = || println!("Some helpful closure");
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: binding to `_` prefixed variable with no side-effect
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2021-10-21 11:11:36 +00:00
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let _duck = Struct { field: 0 };
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: binding to `_` prefixed variable with no side-effect
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2021-10-21 11:11:36 +00:00
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let _cat = [2, 4, 6, 8][2];
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2023-08-24 19:32:12 +00:00
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//~^ ERROR: binding to `_` prefixed variable with no side-effect
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2024-01-25 18:17:36 +00:00
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let _issue_12166 = 42;
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let underscore_variable_above_can_be_used_dont_lint = _issue_12166;
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2015-10-28 16:50:00 +00:00
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2021-06-03 06:41:37 +00:00
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#[allow(clippy::no_effect)]
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0;
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2015-10-28 16:50:00 +00:00
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// Do not warn
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get_number();
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2016-05-25 16:51:35 +00:00
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unsafe { unsafe_fn() };
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2021-10-21 11:11:36 +00:00
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let _used = get_struct();
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let _x = vec![1];
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2017-09-18 19:07:33 +00:00
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DropUnit;
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DropStruct { field: 0 };
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DropTuple(0);
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DropEnum::Tuple(0);
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DropEnum::Struct { field: 0 };
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2021-12-06 11:33:31 +00:00
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GreetStruct1("world");
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GreetStruct2()("world");
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GreetStruct3 {}("world");
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2023-12-16 13:12:50 +00:00
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fn n() -> i32 {
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42
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}
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Cout << 142;
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-Cout;
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2015-10-28 16:50:00 +00:00
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}
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