Clippy lint · Restriction · checked with Clippy 0.1.99

clippy::rest_pat_in_fully_bound_structs: Checks for unnecessary ‘..’ pattern binding on struct when all fields are explicitly matched

What it meansChecks for unnecessary ‘..’ pattern binding on struct when all fields are explicitly matched. It is in the restriction group and off by default.

Does it matter?

Correctness and readability. It’s like having a wildcard pattern after matching all enum variants explicitly.

Lints that forbid language features for specific codebases (no unwrap, no indexing...). Off by default; pick them one by one, never the whole group.

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 a = A { a: 5 };

match a {
    A { a: 5, .. } => {},
    _ => {},
}

Write this instead

match a {
    A { a: 5 } => {},
    _ => {},
}

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]
rest_pat_in_fully_bound_structs = "warn"

In code

#![warn(clippy::rest_pat_in_fully_bound_structs)]

One run

cargo clippy -- -W clippy::rest-pat-in-fully-bound-structs

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.

Restrictiongroup

allowdefault level

yesfixed by cargo clippy --fix

1.43.0added in Rust

Clippy's own documentation

What it does

Checks for unnecessary ‘..’ pattern binding on struct when all fields are explicitly matched.

Why restrict this?

Correctness and readability. It’s like having a wildcard pattern after matching all enum variants explicitly.

Example

let a = A { a: 5 };

match a {
    A { a: 5, .. } => {},
    _ => {},
}

Use instead:

match a {
    A { a: 5 } => {},
    _ => {},
}

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

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