src/Pure/skip_proof.ML
author wenzelm
Wed, 27 Mar 2013 14:19:18 +0100
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child 51552 c713c9505f68
permissions -rw-r--r--
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(*  Title:      Pure/skip_proof.ML
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    Author:     Makarius
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Skip proof via oracle invocation.
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*)
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signature SKIP_PROOF =
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sig
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  val report: Proof.context -> unit
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  val make_thm_cterm: cterm -> thm
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  val make_thm: theory -> term -> thm
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  val cheat_tac: theory -> tactic
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end;
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structure Skip_Proof: SKIP_PROOF =
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struct
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(* report *)
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fun report ctxt =
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  Context_Position.if_visible ctxt Output.report
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    (Markup.markup Markup.bad "Skipped proof");
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(* oracle setup *)
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val (_, make_thm_cterm) =
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  Context.>>> (Context.map_theory_result (Thm.add_oracle (Binding.name "skip_proof", I)));
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fun make_thm thy prop = make_thm_cterm (Thm.cterm_of thy prop);
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(* cheat_tac *)
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fun cheat_tac thy st =
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  ALLGOALS (rtac (make_thm thy (Var (("A", 0), propT)))) st;
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end;