more robust toplevel_error reporting (NB: Context.proof_of on a stale theory crashes ungracefully);
(* Title: Pure/Isar/skip_proof.ML
Author: Markus Wenzel, TU Muenchen
Skipping proofs -- via oracle (in quick and dirty mode) or by forking
(parallel mode).
*)
signature SKIP_PROOF =
sig
val make_thm_cterm: cterm -> thm
val make_thm: theory -> term -> thm
val cheat_tac: theory -> tactic
val prove: Proof.context -> string list -> term list -> term ->
({prems: thm list, context: Proof.context} -> tactic) -> thm
val prove_global: theory -> string list -> term list -> term ->
({prems: thm list, context: Proof.context} -> tactic) -> thm
end;
structure Skip_Proof: SKIP_PROOF =
struct
(* oracle setup *)
val (_, make_thm_cterm) =
Context.>>> (Context.map_theory_result (Thm.add_oracle (Binding.name "skip_proof", I)));
fun make_thm thy prop = make_thm_cterm (Thm.cterm_of thy prop);
(* basic cheating *)
fun cheat_tac thy st =
ALLGOALS (Tactic.rtac (make_thm thy (Var (("A", 0), propT)))) st;
fun prove ctxt xs asms prop tac =
(if Goal.future_enabled () then Goal.prove_future else Goal.prove) ctxt xs asms prop
(fn args => fn st =>
if ! quick_and_dirty
then cheat_tac (Proof_Context.theory_of ctxt) st
else tac args st);
fun prove_global thy xs asms prop tac =
Drule.export_without_context (prove (Proof_Context.init_global thy) xs asms prop tac);
end;