Clippy lints / Style
Clippy lint · Style · checked with Clippy 0.1.99
clippy::byte_char_slices: can be more succinctly written as a byte str
What it meansChecks for hard to read slices of byte characters, that could be more easily expressed as a byte string. It is in the style group and warns by default.
What you see
warning: can be more succinctly written as a byte str --> main.rs:3:1 | 3 | &[b'H', b'e', b'l', b'l', b'o']; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b"Hello"` | = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#byte_char_slices = note: `#[warn(clippy::byte_char_slices)]` 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?
Potentially makes the string harder to read.
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
&[b'H', b'e', b'l', b'l', b'o'];
Write this instead
b"Hello"
Turn it off, or on
Allow it where it does not fit your code, as narrowly as you can:
On one item
#[allow(clippy::byte_char_slices)]
fn my_function() { /* ... */ }Whole crate (Cargo.toml)
[lints.clippy]
byte_char_slices = "allow"One run
cargo clippy -- -A clippy::byte-char-slicesThe [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.
Clippy's own documentation
What it does
Checks for hard to read slices of byte characters, that could be more easily expressed as a byte string.
Why is this bad?
Potentially makes the string harder to read.
Example
&[b'H', b'e', b'l', b'l', b'o'];
Use instead:
b"Hello"
From the Clippy lint list (0.1.99), part of the Rust project, MIT or Apache-2.0. Official entry.
Related lints
- needless_returnunneeded `return` statement
- new_without_defaultChecks for public types with a pub fn new() -> Self method and no implementation of Default
- len_zeroChecks for getting the length of something via .len() just to compare to zero, and suggests using .is_empty() where applicable
- borrow_interior_mutable_constborrow of a named constant with interior mutability
- box_default`Box::new(_)` of default value
- builtin_type_shadowthis generic shadows the built-in type `u32`
- bytes_nthcalled `.bytes().nth()` on a `str`
- chars_last_cmpChecks for usage of _.chars().last() or _.chars().next_back() on a str to check if it ends with a given char
- chars_next_cmpyou should use the `starts_with` method
All 847 Clippy lints · Rust compiler errors · Cargo.toml checker
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