src/HOL/Quickcheck_Examples/Quickcheck_Nesting.thy

more robust build_hierarchy: support Resources.empty / Sessions.Structure.empty (required for Build_Job.print_log);
removed unused imports_hierarchy;

theory Quickcheck_Nesting
imports Main
begin

ML \<open>
let
  open BNF_FP_Def_Sugar
  open BNF_LFP_Compat

  val compat_plugin = Plugin_Name.declare_setup \<^binding>\<open>compat\<close>;

  fun compat fp_sugars =
    perhaps (try (datatype_compat (map (fst o dest_Type o #T) fp_sugars)));
in
  Theory.setup (fp_sugars_interpretation compat_plugin compat)
end
\<close>

end