clippy::unused_rounding: used the `ceil` method with a whole number float

What you see

warning: used the `ceil` method with a whole number float
 --> main.rs:3:9
  |
3 | let x = 1f32.ceil();
  |         ^^^^^^^^^^^ help: remove the `ceil` method call: `1f32`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#unused_rounding
  = note: `-W clippy::unused-rounding` implied by `-W clippy::nursery`

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?

This is unnecessary and confusing to the reader. Doing this is probably a mistake.

New lints still being finished. Off by default and may have false positives.

How to fix it

Clippy can fix this one for you: run cargo clippy --fix (add --allow-dirty if you have uncommitted changes). Review the diff before you commit.

Flagged

let x = 1f32.ceil();

Write this instead

let x = 1f32;

Turn it off, or on

It is off by default. To use it, set it to warn or deny:

[lints.clippy]
unused_rounding = "warn"

#![warn(clippy::unused_rounding)]

cargo clippy -- -W clippy::unused-rounding

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.