Clippy lints / Pedantic
Clippy lint · Pedantic · checked with Clippy 0.1.99
clippy::checked_conversions: Checks for explicit bounds checking when casting
What it meansChecks for explicit bounds checking when casting. It is in the pedantic group and off by default.
Does it matter?
Reduces the readability of statements & is error prone.
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
foo <= i32::MAX as u32;
Write this instead
i32::try_from(foo).is_ok();
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]
checked_conversions = "warn"In code
#![warn(clippy::checked_conversions)]One run
cargo clippy -- -W clippy::checked-conversionsThe [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
Clippy's own documentation
What it does
Checks for explicit bounds checking when casting.
Why is this bad?
Reduces the readability of statements & is error prone.
Example
foo <= i32::MAX as u32;
Use instead:
i32::try_from(foo).is_ok();
Configuration
-
msrv: The minimum rust version that the project supports. Defaults to therust-versionfield inCargo.toml(default:
current version)
From the Clippy lint list (0.1.99), part of the Rust project, MIT or Apache-2.0. Official entry.
Related lints
- too_many_linesChecks for functions with a large amount of lines
- missing_errors_docChecks the doc comments of publicly visible functions that return a Result type and warns if there is no # Errors section
- must_use_candidateChecks for public functions that have no #[must_use] attribute, but return something not already marked must-use, have no mutable arg and mutate no statics
- cast_precision_losscasting `u64` to `f64` may cause a loss of precision (`u64` is 64 bits wide, but `f64`'s mantissa is only 52 bits wide)
- cast_ptr_alignmentcasting from `*const u8` to a more-strictly-aligned pointer (`*const u16`) (1 < 2 bytes)
- cast_sign_losscasting `i8` to `u64` may lose the sign of the value
- cloned_instead_of_copiedused `cloned` where `copied` could be used instead
- collapsible_else_ifChecks for collapsible else { if
- comparison_chainChecks comparison chains written with if that can be rewritten with match and cmp
All 847 Clippy lints · Rust compiler errors · Cargo.toml checker
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