Clippy lint · Pedantic · checked with Clippy 0.1.99

clippy::elidable_lifetime_names: Checks for lifetime annotations which can be replaced with anonymous lifetimes ('_)

What it meansChecks for lifetime annotations which can be replaced with anonymous lifetimes ('_). It is in the pedantic group and off by default.

Does it matter?

The additional lifetimes can make the code look more complicated.

Stricter lints with some false positives. Off by default; opt in with clippy::pedantic.

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

fn f<'a>(x: &'a str) -> Chars<'a> {
    x.chars()
}

Write this instead

fn f(x: &str) -> Chars<'_> {
    x.chars()
}

Turn it off, or on

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

Whole crate (Cargo.toml)

[lints.clippy]
elidable_lifetime_names = "warn"

In code

#![warn(clippy::elidable_lifetime_names)]

One run

cargo clippy -- -W clippy::elidable-lifetime-names

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.

Pedanticgroup

allowdefault level

yesfixed by cargo clippy --fix

1.87.0added in Rust

Clippy's own documentation

What it does

Checks for lifetime annotations which can be replaced with anonymous lifetimes ('_).

Why is this bad?

The additional lifetimes can make the code look more complicated.

Known problems

This lint ignores functions with where clauses that reference lifetimes to prevent false positives.

Example

fn f<'a>(x: &'a str) -> Chars<'a> {
    x.chars()
}

Use instead:

fn f(x: &str) -> Chars<'_> {
    x.chars()
}

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

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