Clippy lint · Restriction · checked with Clippy 0.1.99

clippy::disallowed_script_idents: identifier `счётчик` has a Unicode script that is not allowed by configuration: Cyrillic

What it meansChecks for usage of unicode scripts other than those explicitly allowed by the lint config. This lint doesn’t take into account non-text scripts such as Unknown and Linear_A. It also ignores the Common script type. While configuring, be sure to use official script name aliases from the list of supported scripts. See also: non_ascii_idents. It is in the restriction group and off by default.

What you see

warning: identifier `счётчик` has a Unicode script that is not allowed by configuration: Cyrillic
 --> main.rs:6:5
  |
6 | let счётчик = 10; // OK, cyrillic is allowed.
  |     ^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#disallowed_script_idents
  = note: requested on the command line with `-W clippy::disallowed-script-idents`

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?

It may be not desired to have many different scripts for identifiers in the codebase. Note that if you only want to allow typical English, you might want to use built-in non_ascii_idents lint instead.

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 does not fix this one automatically. Change the code by hand:

Flagged

// Assuming that `clippy.toml` contains the following line:
// allowed-scripts = ["Latin", "Cyrillic"]
let counter = 10; // OK, latin is allowed.
let счётчик = 10; // OK, cyrillic is allowed.
let zähler = 10; // OK, it's still latin.
let カウンタ = 10; // Will spawn the lint.

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]
disallowed_script_idents = "warn"

In code

#![warn(clippy::disallowed_script_idents)]

One run

cargo clippy -- -W clippy::disallowed-script-idents

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

allowed-scripts: The list of unicode scripts allowed to be used in the scope.

Restrictiongroup

allowdefault level

nofixed by cargo clippy --fix

1.55.0added in Rust

Clippy's own documentation

What it does

Checks for usage of unicode scripts other than those explicitly allowed by the lint config.

This lint doesn’t take into account non-text scripts such as Unknown and Linear_A. It also ignores the Common script type. While configuring, be sure to use official script name aliases from the list of supported scripts.

Why restrict this?

It may be not desired to have many different scripts for identifiers in the codebase.

Note that if you only want to allow typical English, you might want to use built-in non_ascii_idents lint instead.

Example

// Assuming that `clippy.toml` contains the following line:
// allowed-scripts = ["Latin", "Cyrillic"]
let counter = 10; // OK, latin is allowed.
let счётчик = 10; // OK, cyrillic is allowed.
let zähler = 10; // OK, it's still latin.
let カウンタ = 10; // Will spawn the lint.

Configuration

allowed-scripts: The list of unicode scripts allowed to be used in the scope.

(default: ["Latin"])

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

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