clippy::redundant_field_names: redundant field names in struct initialization

What you see

warning: redundant field names in struct initialization
 --> main.rs:9:17
  |
9 | let foo = Foo { bar: bar };
  |                 ^^^^^^^^ help: replace it with: `bar`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#redundant_field_names
  = note: `#[warn(clippy::redundant_field_names)]` 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?

If the field and variable names are the same, the field name is redundant.

Code that works but is not idiomatic Rust. 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

let bar: u8 = 123;

struct Foo {
    bar: u8,
}

let foo = Foo { bar: bar };

Write this instead

let foo = Foo { bar };

Turn it off, or on

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

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

[lints.clippy]
redundant_field_names = "allow"

cargo clippy -- -A clippy::redundant-field-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.

Settings in clippy.toml

• msrv: The minimum rust version that the project supports. Defaults to the rust-version field in Cargo.toml