Clippy · Correctness

Unwrapped option_env! instead of env!

clippy::option_env_unwrap

Use env! for a variable required at build time, or handle the None option_env! returns when it is unset.

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

Not a defect when

The variable is always provided at compile time by the crate's own build script through cargo:rustc-env, so the unwrap cannot fail, though env! would say so directly.

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

Set it once in rust-doctor.toml

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