Clippy lint · Complexity · checked with Clippy 0.1.99

clippy::int_plus_one: unnecessary `>= y + 1` or `x - 1 >=`

What it meansChecks for usage of x >= y + 1 or x - 1 >= y (and <=) in a block It is in the complexity group and warns by default.

What you see

warning: unnecessary `>= y + 1` or `x - 1 >=`
 --> main.rs:3:4
  |
3 | if x >= y + 1 {}
  |    ^^^^^^^^^^ help: change it to: `x > y`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#int_plus_one
  = note: `#[warn(clippy::int_plus_one)]` 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?

Readability - better to use > y instead of >= y + 1.

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

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

if x >= y + 1 {}

Write this instead

if x > y {}

Turn it off, or on

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

On one item

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

Whole crate (Cargo.toml)

[lints.clippy]
int_plus_one = "allow"

One run

cargo clippy -- -A clippy::int-plus-one

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.

Complexitygroup

warndefault level

yesfixed by cargo clippy --fix

pre 1.29.0added in Rust

Clippy's own documentation

What it does

Checks for usage of x >= y + 1 or x - 1 >= y (and <=) in a block

Why is this bad?

Readability - better to use > y instead of >= y + 1.

Example

if x >= y + 1 {}

Use instead:

if x > y {}

From the Clippy lint list (0.1.99), part of the Rust project, MIT or Apache-2.0. Official entry.

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