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(* Title: HOL/Metis_Examples/Type_Encodings.thy
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Author: Jasmin Blanchette, TU Muenchen
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Example that exercises Metis's (and hence Sledgehammer's) type encodings.
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*)
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header {*
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Example that Exercises Metis's (and Hence Sledgehammer's) Type Encodings
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*}
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theory Type_Encodings
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imports Main
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begin
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declare [[metis_new_skolemizer]]
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sledgehammer_params [prover = e, blocking, timeout = 10, preplay_timeout = 0]
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text {* Setup for testing Metis exhaustively *}
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lemma fork: "P \<Longrightarrow> P \<Longrightarrow> P" by assumption
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ML {*
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val type_encs =
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["erased",
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"poly_guards",
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"poly_guards_uniform",
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"poly_tags",
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"poly_tags_uniform",
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"poly_args",
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"raw_mono_guards",
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"raw_mono_guards_uniform",
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"raw_mono_tags",
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"raw_mono_tags_uniform",
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"raw_mono_args",
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"mono_guards",
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"mono_guards_uniform",
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"mono_tags",
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"mono_tags_uniform",
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"mono_args",
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"simple",
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"poly_guards?",
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"poly_guards_uniform?",
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"poly_tags?",
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"poly_tags_uniform?",
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"raw_mono_guards?",
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"raw_mono_guards_uniform?",
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"raw_mono_tags?",
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"raw_mono_tags_uniform?",
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"mono_guards?",
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"mono_guards_uniform?",
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"mono_tags?",
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"mono_tags_uniform?",
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"simple?",
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"poly_guards!",
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"poly_guards_uniform!",
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"poly_tags!",
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"poly_tags_uniform!",
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"raw_mono_guards!",
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"raw_mono_guards_uniform!",
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"raw_mono_tags!",
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"raw_mono_tags_uniform!",
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"mono_guards!",
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"mono_guards_uniform!",
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"mono_tags!",
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"mono_tags_uniform!",
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"simple!"]
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fun metis_exhaust_tac ctxt ths =
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let
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fun tac [] st = all_tac st
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| tac (type_enc :: type_encs) st =
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st (* |> tap (fn _ => tracing (PolyML.makestring type_enc)) *)
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|> ((if null type_encs then all_tac else rtac @{thm fork} 1)
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THEN Metis_Tactics.metis_tac [type_enc] ctxt ths 1
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THEN COND (has_fewer_prems 2) all_tac no_tac
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THEN tac type_encs)
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in tac end
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*}
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method_setup metis_exhaust = {*
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Attrib.thms >>
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(fn ths => fn ctxt => SIMPLE_METHOD (metis_exhaust_tac ctxt ths type_encs))
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*} "exhaustively run the new Metis with all type encodings"
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text {* Miscellaneous tests *}
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lemma "x = y \<Longrightarrow> y = x"
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by metis_exhaust
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lemma "[a] = [1 + 1] \<Longrightarrow> a = 1 + (1::int)"
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by (metis_exhaust last.simps)
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lemma "map Suc [0] = [Suc 0]"
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by (metis_exhaust map.simps)
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lemma "map Suc [1 + 1] = [Suc 2]"
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by (metis_exhaust map.simps nat_1_add_1)
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lemma "map Suc [2] = [Suc (1 + 1)]"
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by (metis_exhaust map.simps nat_1_add_1)
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definition "null xs = (xs = [])"
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lemma "P (null xs) \<Longrightarrow> null xs \<Longrightarrow> xs = []"
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by (metis_exhaust null_def)
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lemma "(0::nat) + 0 = 0"
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by (metis_exhaust arithmetic_simps(38))
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end
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