doc-src/IsarImplementation/Thy/ROOT.ML

renamed contravariant relator set_rel to vset_rel, to make room for new covariant relator

use_thys [
  "Eq",
  "Integration",
  "Isar",
  "Local_Theory",
  "Logic",
  "ML",
  "Prelim",
  "Proof",
  "Syntax",
  "Tactic"
];