matita/matita/contribs/lambda-delta/Basic-2/grammar/lenv.ma

   1 (**************************************************************************)
   2 (*       ___                                                              *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
   6 (*      ||I||       Developers:                                           *)
   7 (*      ||T||         The HELM team.                                      *)
   8 (*      ||A||         http://helm.cs.unibo.it                             *)
   9 (*      \   /                                                             *)
  10 (*       \ /        This file is distributed under the terms of the       *)
  11 (*        v         GNU General Public License Version 2                  *)
  12 (*                                                                        *)
  13 (**************************************************************************)
  14
  15 include "Basic-2/grammar/term.ma".
  16
  17 (* LOCAL ENVIRONMENTS *******************************************************)
  18
  19 (* local environments *)
  20 inductive lenv: Type[0] ≝
  21 | LAtom: lenv                       (* empty *)
  22 | LPair: lenv → bind2 → term → lenv (* binary binding construction *)
  23 .
  24
  25 interpretation "sort (local environment)" 'Star = LAtom.
  26
  27 interpretation "environment binding construction (binary)" 'DBind L I T = (LPair L I T).