miss-spares-rho.yaml

# SPDX-FileCopyrightText: Copyright (c) 2025 Objectionary.com
# SPDX-License-Identifier: MIT
---
# 'miss' answers ⊥ for an attribute the formation does not declare, save ρ,
# which a formation without a receiver merely ignores (#1407).
rules:
  basic: ['miss']
input: |
  ⟦ a ↦ ⟦ k ↦ ∅ ⟧( ρ ↦ Φ.x ), b ↦ ⟦ k ↦ ∅ ⟧( t ↦ Φ.x ) ⟧
output: |-
  ⟦ a ↦ ⟦ k ↦ ∅ ⟧( ρ ↦ Φ.x ), b ↦ ⊥ ⟧