Clippy · Correctness

Bit mask comparison with a constant result

clippy::bad_bit_mask

Fix the mask or the constant: this bit-mask comparison can never be true, or is always true.

Category: Correctness
Default level: warn
Tier: P1
Producer: Clippy
Diff scope: line

Not a defect when

The mask or the compared value is a cfg- or target-dependent constant that only makes the result fixed in this configuration, while it varies on other builds.

What it reads

Clippy, with the compiler behind it. The only pass that compiles.

Tier

Serious: worth interrupting other work for.

The tier bounds how severe a rule may be; its category bounds the tier.

Diff scope

The changed line itself.

What --scope contextual looks at to decide whether a change caused the finding.

Change it

Turn it off, or make it blocking, without touching the code it flags:

rust-doctor --rule clippy::bad_bit_mask=off .
rust-doctor --rule clippy::bad_bit_mask=error .

Set it once in rust-doctor.toml

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