clippy::no_effect: statement with no effect

What you see

warning: statement with no effect
 --> main.rs:3:1
  |
3 | 0;
  | ^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#no_effect
  = note: `#[warn(clippy::no_effect)]` on by default

Real output of Clippy 0.1.99 (Rust 1.99) on the example below. Names and line numbers in yours will differ.

Does it matter?

Unlike dead code, these statements are actually executed. However, as they have no effect, all they do is make the code less readable.

Code that does something simple in a complicated way. Warns by default.

How to fix it

Clippy does not fix this one automatically (its suggestion may change behaviour, so it only shows it). Change the code by hand:

Flagged

0;

Turn it off, or on

Allow it where it does not fit your code, as narrowly as you can:

#[allow(clippy::no_effect)]
fn my_function() { /* ... */ }

[lints.clippy]
no_effect = "allow"

cargo clippy -- -A clippy::no-effect

The [lints] table needs Rust 1.74 or newer. In a workspace, put it under [workspace.lints.clippy] and add [lints] workspace = true to each member.