S0022: some pattern requires Option

Generated from rellum-diagnostics/src/db.rs.

Explanation

The some(x) pattern extracts the payload from an Option value. It cannot match Result, Bool, enum, record, or scalar values because those types do not have Option's some/none shape.

Common causes

• using some(x) while matching a Result
• matching a plain value as if it were optional
• forgetting that a request handler has already converted an Option

Canonical fixes

• match an Option value with some and none arms

Before:

match value
    some(x) => x

After:

match maybe
    some(x) => x
    none => fallback

• use ok/err when matching Result

Before:

match result
    some(x) => x

After:

match result
    ok(x) => x
    err(_) => fallback

Code example

match value
    some(x) => x

Links

• RellC diagnostic overview