> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sifr.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# SIFR-RUST-SLOT-0003: A selected method has an invalid method-slot signature.

> A selected method has an invalid method-slot signature.

`SIFR-RUST-SLOT-0003` belongs to the **Rust method slots** diagnostic family. It means: a selected method has an invalid method-slot signature.

## Why It Happens

A compiler-emitted method-slot table, context, signature, or call-scoped handler contract was violated.

<Info>
  Use `sifr --explain SIFR-RUST-SLOT-0003` locally to see the renderer's exact message template and any machine-applicable suggestions for the compiler version you are running.
</Info>

## Details

| Field                  | Value                                                                                     |
| ---------------------- | ----------------------------------------------------------------------------------------- |
| Code                   | `SIFR-RUST-SLOT-0003`                                                                     |
| Family                 | `RUST-SLOT`                                                                               |
| Severity               | Error                                                                                     |
| Stability              | stable                                                                                    |
| Owner                  | `sifr_frontend::specialization_runner`                                                    |
| Representative fixture | `crates/sifr_frontend/src/slot_table_tests.rs::non_result_slot_uses_signature_diagnostic` |

See the [Error Codes index](/diagnostics/error-codes) for the complete catalog.