skip-drops-an-undeclared-rho.yaml

# SPDX-FileCopyrightText: Copyright (c) 2025 Objectionary.com
# SPDX-License-Identifier: MIT
---
# A formation that declares no ρ has no receiver, so a ρ applied to it is
# dropped and the formation stays as it was written (#1407).
rules:
  basic: ['skip']
input: |
  ⟦ a ↦ ⟦ k ↦ ∅ ⟧( ρ ↦ Φ.x ) ⟧
output: |-
  ⟦ a ↦ ⟦ k ↦ ∅ ⟧ ⟧