src/HOL/Predicate_Compile_Examples/ROOT.ML

added "trace_metis" configuration option, replacing old-fashioned references

use_thys [
  "Examples",
  "Predicate_Compile_Tests",
  "Predicate_Compile_Quickcheck_Examples",
  "Specialisation_Examples",
  "IMP_1",
  "IMP_2",
  "IMP_3",
  "IMP_4"];

if getenv "EXEC_SWIPL" = "" andalso getenv "EXEC_YAP" = "" then
  (warning "No prolog system found - skipping some example theories"; ())
else
  (use_thys [
    "Code_Prolog_Examples",
    "Context_Free_Grammar_Example",
    "Hotel_Example",
    "Lambda_Example",
    "List_Examples"];
   Unsynchronized.setmp quick_and_dirty true use_thys ["Reg_Exp_Example"]);