Consider the following enum:

#[derive(Default, Archive, Serialize, Deserialize)]
#[allow(non_camel_case_types)]
pub enum UserVerificationPolicy {
    Required,
    Preferred,
    Discouraged_DO_NOT_USE,
}

Without the Archive derivation, this compiles fine. Once added, the following error appears: variant 'Discouraged_DO_NOT_USE' should have an upper camel case name. The Archive macro should probably mirror allow attributes to the archived type.

Note that the project uses #![deny(warnings)] globally, hence the error instead of warning.

Workaround

Specify the allow rule file-wide, using #![allow(non_camel_case_types)]