killed "expand_defs_tac";
it has no raison d'etre now that Skolemization is always done "inline";
the comment in the code suggested that it was used for other things as well but the code clearly did nothing if no Skolem "Frees" were in the problem
(* Title: HOL/Tools/Sledgehammer/meson_tactic.ML
Author: Jia Meng, Cambridge University Computer Laboratory
Author: Jasmin Blanchette, TU Muenchen
MESON general tactic and proof method.
*)
signature MESON_TACTIC =
sig
val meson_general_tac : Proof.context -> thm list -> int -> tactic
val setup: theory -> theory
end;
structure Meson_Tactic : MESON_TACTIC =
struct
fun meson_general_tac ctxt ths =
let
val thy = ProofContext.theory_of ctxt
val ctxt0 = Classical.put_claset HOL_cs ctxt
in Meson.meson_tac ctxt0 (maps (Clausifier.cnf_axiom thy) ths) end
val setup =
Method.setup @{binding meson} (Attrib.thms >> (fn ths => fn ctxt =>
SIMPLE_METHOD' (CHANGED_PROP o meson_general_tac ctxt ths)))
"MESON resolution proof procedure";
end;