S0092: ? operand is not a Result

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

Explanation

The ? operator can only unwrap Result values. It extracts ok(v) for continued execution and returns err(e) early; non-Result values have no ok/err shape to inspect.

Common causes

• placing ? after an Int, String, Option, or other non-Result value
• calling a helper that returns a plain value but treating it as fallible
• using ? on a request's stored value after handlers have converted it

Canonical fixes

• remove ? when the expression is not fallible

Before:

value = count?

After:

value = count

• return Result from the helper if it can fail
• use match for Option values

Before:

value = maybe?

After:

value = match maybe
    some(v) => v
    none => fallback

Code example

value = count?

Links

• RellC diagnostic overview