# PR-5.6 — Syscall Multi-Return Tests

### Briefing

We must ensure multi-return syscalls behave correctly with the slot-based ABI.

### Target

* Add deterministic tests covering multi-return behavior.

### Work items

* Create or adapt at least one syscall with `ret_slots > 1`.
* Add tests:

  * Verify correct stack results after syscall.
  * Verify incorrect caller expectations fail verification.

### Acceptance checklist

* [ ] Multi-return syscalls behave correctly.
* [ ] Verifier catches mismatches.
* [ ] `cargo test` passes.

### Tests

* New multi-return syscall tests.

### Junie instructions

**You MAY:**

* Add deterministic tests.
* Use existing syscalls or create a simple test-only syscall.

**You MUST NOT:**

* Modify syscall semantics to satisfy tests.
* Add nondeterministic behavior.

**If unclear:**

* Ask before introducing new test syscalls.