anonymous-metas.yaml

# SPDX-FileCopyrightText: Copyright (c) 2025 Objectionary.com
# SPDX-License-Identifier: MIT
---
# A meta written without an index is anonymous: it matches whatever term
# stands in its place, and every occurrence matches on its own. The rule below
# is the one from #218 — it needs two attributes and two expressions but names
# none of them, which spelled with indexes would be rejected as a duplicated
# attribute.
input: '⟦ a ↦ Φ, ρ ↦ Φ.z ⟧'
output: '⟦ x ↦ ⟦ Δ ⤍ 2A- ⟧ ⟧'
rules:
  custom:
    - name: anonymous-metas
      pattern: '⟦ 𝜏 ↦ 𝑒, 𝜏 ↦ 𝑒 ⟧'
      result: '⟦ x ↦ ⟦ Δ ⤍ 2A- ⟧ ⟧'