ra_ap_span 0.0.347 fails with allowed Salsa 0.28.4 after HashEqLike::hash removal

rust-analyzer version: published ra_ap_span 0.0.347 (through evcxr 0.22.0).

rustc version: rustc 1.96.0 (ac68faa20 2026-05-25), aarch64-apple-darwin.

editor or extension: none; building a published library consumer.

relevant settings: fresh Cargo resolution, default Salsa feature enabled.

The published ra_ap_span manifest allows salsa = "0.28.2" and enables salsa_unstable. It now resolves to Salsa 0.28.4, whose HashEqLike trait no longer contains hash. The manual implementation in src/hygiene.rs:93 still defines and calls that method, so compilation fails with E0407. This follows the Salsa 0.28.3 internal API change; salsa-rs/salsa#1321 fixed Salsa's own optional-feature implementations but the RA implementation remains incompatible.

code snippet to reproduce:

Use an empty src/lib.rs with:

[package]
name = "ra-span-salsa-repro"
version = "0.1.0"
edition = "2024"

[dependencies]
ra_ap_span = "=0.0.347"
salsa = "=0.28.4"
# Avoid the independent Unicode version assertion in the lexer.
unicode-ident = "=1.0.24"

Run cargo check:

error[E0407]: method `hash` is not a member of trait `zalsa_::HashEqLike`
  --> ra_ap_span-0.0.347/src/hygiene.rs:93:9

Expected: the dependency versions allowed by the published manifest compile together.

A compatible Salsa constraint (including macro-rules) for this RA release, or a new release adapting the manual interned implementation, would prevent fresh consumer failures. Discovered during Reinhardt workspace verification for https://github.com/kent8192/reinhardt-web/pull/6340 after repairing its independent Unicode dependency mismatch.

🤖 Generated with Codex

Start with src/hygiene.rs:93 and the published ra_ap_span manifest, then reproduce the failure with the minimal Cargo project and cargo check. Compare the allowed Salsa versions and the HashEqLike implementation against the reported API change. Done means a fresh consumer using the manifest's permitted dependency versions compiles successfully.